398140690 has 8 divisors (see below), whose sum is σ = 716653260. Its totient is φ = 159256272.

The previous prime is 398140679. The next prime is 398140711. The reversal of 398140690 is 96041893.

It can be written as a sum of positive squares in 2 ways, for example, as 352050169 + 46090521 = 18763^2 + 6789^2 .

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

It is a super-2 number, since 2×398140690² = 317032018067352200, which contains 22 as substring.

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, 19907025 + ... + 19907044.

Almost surely, 2^398140690 is an apocalyptic number.

398140690 is a deficient number, since it is larger than the sum of its proper divisors (318512570).

398140690 is a wasteful number, since it uses less digits than its factorization.

398140690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39814076.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 398140690 is about 19953.4631079419. The cubic root of 398140690 is about 735.6629001810.

The spelling of 398140690 in words is "three hundred ninety-eight million, one hundred forty thousand, six hundred ninety".