398023453881 has 15 divisors (see below), whose sum is σ = 594586728021. Its totient is φ = 265345183908.

The previous prime is 398023453873. The next prime is 398023453889. The reversal of 398023453881 is 188354320893.

The square root of 398023453881 is 630891.

It is a perfect power (a square), and thus also a powerful number.

398023453881 is a `hidden beast` number, since 3 + 9 + 8 + 0 + 23 + 4 + 538 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (398023453873) and next prime (398023453889).

It is not a de Polignac number, because 398023453881 - 2³ = 398023453873 is a prime.

It is a super-2 number, since 2×398023453881² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (398023453889) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 5642970 + ... + 5713068.

Almost surely, 2^398023453881 is an apocalyptic number.

398023453881 is the 630891-st square number.

398023453881 is the 315446-th centered octagonal number.

It is an amenable number.

398023453881 is a deficient number, since it is larger than the sum of its proper divisors (196563274140).

398023453881 is an frugal number, since it uses more digits than its factorization.

398023453881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140210 (or 70102 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 398023453881 in words is "three hundred ninety-eight billion, twenty-three million, four hundred fifty-three thousand, eight hundred eighty-one".