398739744 has 72 divisors (see below), whose sum is σ = 1221151932. Its totient is φ = 122688000.

The previous prime is 398739727. The next prime is 398739769. The reversal of 398739744 is 447937893.

It can be written as a sum of positive squares in 2 ways, for example, as 389667600 + 9072144 = 19740^2 + 3012^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49507 + ... + 56994.

Almost surely, 2^398739744 is an apocalyptic number.

It is an amenable number.

398739744 is an abundant number, since it is smaller than the sum of its proper divisors (822412188).

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

398739744 is a wasteful number, since it uses less digits than its factorization.

398739744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106530 (or 106519 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 398739744 is about 19968.4687444982. The cubic root of 398739744 is about 736.0316818435.

The spelling of 398739744 in words is "three hundred ninety-eight million, seven hundred thirty-nine thousand, seven hundred forty-four".