404686646 has 64 divisors (see below), whose sum is σ = 772039296. Its totient is φ = 154828800.

The previous prime is 404686637. The next prime is 404686657. The reversal of 404686646 is 646686404.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 404686597 and 404686606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1440026 + ... + 1440306.

It is an arithmetic number, because the mean of its divisors is an integer number (12063114).

Almost surely, 2^404686646 is an apocalyptic number.

404686646 is a deficient number, since it is larger than the sum of its proper divisors (367352650).

404686646 is a wasteful number, since it uses less digits than its factorization.

404686646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537.

The product of its (nonzero) digits is 663552, while the sum is 44.

The square root of 404686646 is about 20116.8249482864. The cubic root of 404686646 is about 739.6727588888.

The spelling of 404686646 in words is "four hundred four million, six hundred eighty-six thousand, six hundred forty-six".