398699138 has 8 divisors (see below), whose sum is σ = 599016720. Its totient is φ = 199026900.

The previous prime is 398699137. The next prime is 398699149. The reversal of 398699138 is 831996893.

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

It is a super-2 number, since 2×398699138² = 317922005283886088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (398699131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159788 + ... + 162263.

It is an arithmetic number, because the mean of its divisors is an integer number (74877090).

Almost surely, 2^398699138 is an apocalyptic number.

398699138 is a deficient number, since it is larger than the sum of its proper divisors (200317582).

398699138 is a wasteful number, since it uses less digits than its factorization.

398699138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322672.

The product of its digits is 2519424, while the sum is 56.

The square root of 398699138 is about 19967.4519656365. The cubic root of 398699138 is about 736.0066961918.

The spelling of 398699138 in words is "three hundred ninety-eight million, six hundred ninety-nine thousand, one hundred thirty-eight".