398206538 has 8 divisors (see below), whose sum is σ = 632445732. Its totient is φ = 187391296.

The previous prime is 398206499. The next prime is 398206609. The reversal of 398206538 is 835602893.

It can be written as a sum of positive squares in 2 ways, for example, as 334414369 + 63792169 = 18287^2 + 7987^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5855945 + ... + 5856012.

Almost surely, 2^398206538 is an apocalyptic number.

398206538 is a deficient number, since it is larger than the sum of its proper divisors (234239194).

398206538 is a wasteful number, since it uses less digits than its factorization.

398206538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11711976.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 398206538 is about 19955.1130791083. The cubic root of 398206538 is about 735.7034547400.

The spelling of 398206538 in words is "three hundred ninety-eight million, two hundred six thousand, five hundred thirty-eight".