394839173 has 4 divisors (see below), whose sum is σ = 405510540. Its totient is φ = 384167808.

The previous prime is 394839169. The next prime is 394839197. The reversal of 394839173 is 371938493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 371938493 = 1459 ⋅254927.

It can be written as a sum of positive squares in 2 ways, for example, as 174821284 + 220017889 = 13222^2 + 14833^2 .

It is a cyclic number.

It is not a de Polignac number, because 394839173 - 2² = 394839169 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394839163) 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, 5335628 + ... + 5335701.

It is an arithmetic number, because the mean of its divisors is an integer number (101377635).

Almost surely, 2^394839173 is an apocalyptic number.

It is an amenable number.

394839173 is a deficient number, since it is larger than the sum of its proper divisors (10671367).

394839173 is a wasteful number, since it uses less digits than its factorization.

394839173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10671366.

The product of its digits is 489888, while the sum is 47.

The square root of 394839173 is about 19870.5604601380. The cubic root of 394839173 is about 733.6237984105.

The spelling of 394839173 in words is "three hundred ninety-four million, eight hundred thirty-nine thousand, one hundred seventy-three".