394977216 has 56 divisors (see below), whose sum is σ = 1081095120. Its totient is φ = 127117312.

The previous prime is 394977203. The next prime is 394977217. The reversal of 394977216 is 612779493.

It is a happy number.

It is a super-2 number, since 2×394977216² = 312014002318221312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394977217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29901 + ... + 41036.

It is an arithmetic number, because the mean of its divisors is an integer number (19305270).

Almost surely, 2^394977216 is an apocalyptic number.

It is an amenable number.

394977216 is an abundant number, since it is smaller than the sum of its proper divisors (686117904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

394977216 is a wasteful number, since it uses less digits than its factorization.

394977216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70981 (or 70971 counting only the distinct ones).

The product of its digits is 571536, while the sum is 48.

The square root of 394977216 is about 19874.0337123595. The cubic root of 394977216 is about 733.7092845503.

The spelling of 394977216 in words is "three hundred ninety-four million, nine hundred seventy-seven thousand, two hundred sixteen".