397148666 has 8 divisors (see below), whose sum is σ = 597139284. Its totient is φ = 198102240.

The previous prime is 397148627. The next prime is 397148671. The reversal of 397148666 is 666841793.

It can be written as a sum of positive squares in 2 ways, for example, as 395174641 + 1974025 = 19879^2 + 1405^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234995 + ... + 236678.

Almost surely, 2^397148666 is an apocalyptic number.

397148666 is a deficient number, since it is larger than the sum of its proper divisors (199990618).

397148666 is a wasteful number, since it uses less digits than its factorization.

397148666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472096.

The product of its digits is 1306368, while the sum is 50.

The square root of 397148666 is about 19928.5891623065. The cubic root of 397148666 is about 735.0513891908.

The spelling of 397148666 in words is "three hundred ninety-seven million, one hundred forty-eight thousand, six hundred sixty-six".