396861638 has 8 divisors (see below), whose sum is σ = 595569288. Its totient is φ = 198338544.

The previous prime is 396861637. The next prime is 396861643. The reversal of 396861638 is 836168693.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396861637) 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, 40631 + ... + 49442.

It is an arithmetic number, because the mean of its divisors is an integer number (74446161).

Almost surely, 2^396861638 is an apocalyptic number.

396861638 is a deficient number, since it is larger than the sum of its proper divisors (198707650).

396861638 is a wasteful number, since it uses less digits than its factorization.

396861638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92278.

The product of its digits is 1119744, while the sum is 50.

The square root of 396861638 is about 19921.3864477350. The cubic root of 396861638 is about 734.8742672922.

The spelling of 396861638 in words is "three hundred ninety-six million, eight hundred sixty-one thousand, six hundred thirty-eight".