398438764 has 6 divisors (see below), whose sum is σ = 697267844. Its totient is φ = 199219380.

The previous prime is 398438737. The next prime is 398438771. The reversal of 398438764 is 467834893.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49804842 + ... + 49804849.

Almost surely, 2^398438764 is an apocalyptic number.

It is an amenable number.

398438764 is a deficient number, since it is larger than the sum of its proper divisors (298829080).

398438764 is a wasteful number, since it uses less digits than its factorization.

398438764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99609695 (or 99609693 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 52.

The square root of 398438764 is about 19960.9309402142. The cubic root of 398438764 is about 735.8464427399.

The spelling of 398438764 in words is "three hundred ninety-eight million, four hundred thirty-eight thousand, seven hundred sixty-four".