290400421 has 4 divisors (see below), whose sum is σ = 291605644. Its totient is φ = 289195200.

The previous prime is 290400401. The next prime is 290400431. The reversal of 290400421 is 124004092.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 222337921 + 68062500 = 14911^2 + 8250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-290400421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 290400392 and 290400401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290400401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 602250 + ... + 602731.

It is an arithmetic number, because the mean of its divisors is an integer number (72901411).

Almost surely, 2^290400421 is an apocalyptic number.

It is an amenable number.

290400421 is a deficient number, since it is larger than the sum of its proper divisors (1205223).

290400421 is a wasteful number, since it uses less digits than its factorization.

290400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205222.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 290400421 is about 17041.1390757778. The cubic root of 290400421 is about 662.2151017092.

The spelling of 290400421 in words is "two hundred ninety million, four hundred thousand, four hundred twenty-one".