398478902 has 4 divisors (see below), whose sum is σ = 597718356. Its totient is φ = 199239450.

The previous prime is 398478869. The next prime is 398478919. The reversal of 398478902 is 209874893.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99619724 + ... + 99619727.

It is an arithmetic number, because the mean of its divisors is an integer number (149429589).

Almost surely, 2^398478902 is an apocalyptic number.

398478902 is a deficient number, since it is larger than the sum of its proper divisors (199239454).

398478902 is a wasteful number, since it uses less digits than its factorization.

398478902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199239453.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 398478902 is about 19961.9363289236. The cubic root of 398478902 is about 735.8711511899.

The spelling of 398478902 in words is "three hundred ninety-eight million, four hundred seventy-eight thousand, nine hundred two".