391945396 has 12 divisors (see below), whose sum is σ = 687634948. Its totient is φ = 195478272.

The previous prime is 391945391. The next prime is 391945417. The reversal of 391945396 is 693549193.

It can be written as a sum of positive squares in 2 ways, for example, as 134792100 + 257153296 = 11610^2 + 16036^2 .

It is a super-3 number, since 3×391945396³ (a number of 27 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391945391) 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, 121821 + ... + 124996.

Almost surely, 2^391945396 is an apocalyptic number.

It is an amenable number.

391945396 is a deficient number, since it is larger than the sum of its proper divisors (295689552).

391945396 is a wasteful number, since it uses less digits than its factorization.

391945396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247218 (or 247216 counting only the distinct ones).

The product of its digits is 787320, while the sum is 49.

The square root of 391945396 is about 19797.6108659606. The cubic root of 391945396 is about 731.8271586700.

The spelling of 391945396 in words is "three hundred ninety-one million, nine hundred forty-five thousand, three hundred ninety-six".