397928023 has 4 divisors (see below), whose sum is σ = 398116888. Its totient is φ = 397739160.

The previous prime is 397928021. The next prime is 397928029. The reversal of 397928023 is 320829793.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320829793 = 2269 ⋅141397.

It is a cyclic number.

It is not a de Polignac number, because 397928023 - 2¹ = 397928021 is a prime.

It is a super-2 number, since 2×397928023² = 316693422977377058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397928021) 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, 91236 + ... + 95497.

It is an arithmetic number, because the mean of its divisors is an integer number (99529222).

Almost surely, 2^397928023 is an apocalyptic number.

397928023 is a deficient number, since it is larger than the sum of its proper divisors (188865).

397928023 is a wasteful number, since it uses less digits than its factorization.

397928023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188864.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 397928023 is about 19948.1333211907. The cubic root of 397928023 is about 735.5318919802.

The spelling of 397928023 in words is "three hundred ninety-seven million, nine hundred twenty-eight thousand, twenty-three".