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394104421 = 1723182613
BaseRepresentation
bin10111011111011…
…000111001100101
31000110120120122001
4113133120321211
51301342320141
6103035005301
712523555324
oct2737307145
91013516561
10394104421
11192509537
12abb99831
1363858ca9
143a4ac0bb
15248eba31
hex177d8e65

394104421 has 4 divisors (see below), whose sum is σ = 417287052. Its totient is φ = 370921792.

The previous prime is 394104419. The next prime is 394104439. The reversal of 394104421 is 124401493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124401493 = 196547447.

It can be written as a sum of positive squares in 2 ways, for example, as 350213796 + 43890625 = 18714^2 + 6625^2 .

It is a cyclic number.

It is not a de Polignac number, because 394104421 - 21 = 394104419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 394104421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394104401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11591290 + ... + 11591323.

It is an arithmetic number, because the mean of its divisors is an integer number (104321763).

Almost surely, 2394104421 is an apocalyptic number.

It is an amenable number.

394104421 is a deficient number, since it is larger than the sum of its proper divisors (23182631).

394104421 is a wasteful number, since it uses less digits than its factorization.

394104421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23182630.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 394104421 is about 19852.0633940152. The cubic root of 394104421 is about 733.1684516133.

The spelling of 394104421 in words is "three hundred ninety-four million, one hundred four thousand, four hundred twenty-one".

Divisors: 1 17 23182613 394104421