398940023 has 4 divisors (see below), whose sum is σ = 411809088. Its totient is φ = 386070960.

The previous prime is 398940019. The next prime is 398940029. The reversal of 398940023 is 320049893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320049893 = 599 ⋅534307.

It is a cyclic number.

It is not a de Polignac number, because 398940023 - 2² = 398940019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398940029) 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, 6434486 + ... + 6434547.

It is an arithmetic number, because the mean of its divisors is an integer number (102952272).

Almost surely, 2^398940023 is an apocalyptic number.

398940023 is a deficient number, since it is larger than the sum of its proper divisors (12869065).

398940023 is a wasteful number, since it uses less digits than its factorization.

398940023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12869064.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 398940023 is about 19973.4829962128. The cubic root of 398940023 is about 736.1548925490.

The spelling of 398940023 in words is "three hundred ninety-eight million, nine hundred forty thousand, twenty-three".