396635644 has 12 divisors (see below), whose sum is σ = 724291344. Its totient is φ = 189695264.

The previous prime is 396635627. The next prime is 396635647. The reversal of 396635644 is 446536693.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 396635594 and 396635603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396635647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2155537 + ... + 2155720.

It is an arithmetic number, because the mean of its divisors is an integer number (60357612).

Almost surely, 2^396635644 is an apocalyptic number.

It is an amenable number.

396635644 is a deficient number, since it is larger than the sum of its proper divisors (327655700).

396635644 is a wasteful number, since it uses less digits than its factorization.

396635644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4311284 (or 4311282 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 46.

The square root of 396635644 is about 19915.7134946253. The cubic root of 396635644 is about 734.7347487181.

The spelling of 396635644 in words is "three hundred ninety-six million, six hundred thirty-five thousand, six hundred forty-four".