396864644 has 12 divisors (see below), whose sum is σ = 757650768. Its totient is φ = 180393000.

The previous prime is 396864641. The next prime is 396864661. The reversal of 396864644 is 446468693.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 396864592 and 396864601.

It is not an unprimeable number, because it can be changed into a prime (396864641) 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, 4509782 + ... + 4509869.

It is an arithmetic number, because the mean of its divisors is an integer number (63137564).

Almost surely, 2^396864644 is an apocalyptic number.

It is an amenable number.

396864644 is a deficient number, since it is larger than the sum of its proper divisors (360786124).

396864644 is a wasteful number, since it uses less digits than its factorization.

396864644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9019666 (or 9019664 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 50.

The square root of 396864644 is about 19921.4618941482. The cubic root of 396864644 is about 734.8761227050.

The spelling of 396864644 in words is "three hundred ninety-six million, eight hundred sixty-four thousand, six hundred forty-four".