398615664 has 40 divisors (see below), whose sum is σ = 1030473232. Its totient is φ = 132779520.

The previous prime is 398615617. The next prime is 398615681. The reversal of 398615664 is 466516893.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 128694 + ... + 131754.

Almost surely, 2^398615664 is an apocalyptic number.

It is an amenable number.

398615664 is an abundant number, since it is smaller than the sum of its proper divisors (631857568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398615664 is a wasteful number, since it uses less digits than its factorization.

398615664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5785 (or 5779 counting only the distinct ones).

The product of its digits is 933120, while the sum is 48.

The square root of 398615664 is about 19965.3616045390. The cubic root of 398615664 is about 735.9553277077.

The spelling of 398615664 in words is "three hundred ninety-eight million, six hundred fifteen thousand, six hundred sixty-four".