397910823 has 32 divisors (see below), whose sum is σ = 582266880. Its totient is φ = 240622080.

The previous prime is 397910801. The next prime is 397910831. The reversal of 397910823 is 328019793.

It is not a de Polignac number, because 397910823 - 2⁶ = 397910759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397914823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 614686 + ... + 615332.

It is an arithmetic number, because the mean of its divisors is an integer number (18195840).

Almost surely, 2^397910823 is an apocalyptic number.

397910823 is a deficient number, since it is larger than the sum of its proper divisors (184356057).

397910823 is a wasteful number, since it uses less digits than its factorization.

397910823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 397910823 is about 19947.7021984990. The cubic root of 397910823 is about 735.5212943092.

The spelling of 397910823 in words is "three hundred ninety-seven million, nine hundred ten thousand, eight hundred twenty-three".