399638650 has 48 divisors (see below), whose sum is σ = 764308224. Its totient is φ = 155391680.

The previous prime is 399638587. The next prime is 399638651. The reversal of 399638650 is 56836993.

It is a super-2 number, since 2×399638650² = 319422101147645000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 399638594 and 399638603.

It is not an unprimeable number, because it can be changed into a prime (399638651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 406059 + ... + 407041.

It is an arithmetic number, because the mean of its divisors is an integer number (15923088).

Almost surely, 2^399638650 is an apocalyptic number.

399638650 is a deficient number, since it is larger than the sum of its proper divisors (364669574).

399638650 is a wasteful number, since it uses less digits than its factorization.

399638650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215 (or 1210 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 49.

The square root of 399638650 is about 19990.9642088620. The cubic root of 399638650 is about 736.5843620867.

The spelling of 399638650 in words is "three hundred ninety-nine million, six hundred thirty-eight thousand, six hundred fifty".