397866090 has 32 divisors (see below), whose sum is σ = 985683456. Its totient is φ = 102674880.

The previous prime is 397866089. The next prime is 397866097. The reversal of 397866090 is 90668793.

It is a happy number.

It is a super-3 number, since 3×397866090³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (397866097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212977 + ... + 214836.

It is an arithmetic number, because the mean of its divisors is an integer number (30802608).

Almost surely, 2^397866090 is an apocalyptic number.

397866090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

397866090 is an abundant number, since it is smaller than the sum of its proper divisors (587817366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397866090 is a wasteful number, since it uses less digits than its factorization.

397866090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427854.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 397866090 is about 19946.5809100206. The cubic root of 397866090 is about 735.4937309246.

The spelling of 397866090 in words is "three hundred ninety-seven million, eight hundred sixty-six thousand, ninety".