397930090 has 8 divisors (see below), whose sum is σ = 716274180. Its totient is φ = 159172032.

The previous prime is 397930087. The next prime is 397930103. The reversal of 397930090 is 90039793.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 394459321 + 3470769 = 19861^2 + 1863^2 .

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, 19896495 + ... + 19896514.

Almost surely, 2^397930090 is an apocalyptic number.

397930090 is a deficient number, since it is larger than the sum of its proper divisors (318344090).

397930090 is a wasteful number, since it uses less digits than its factorization.

397930090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39793016.

The product of its (nonzero) digits is 45927, while the sum is 40.

The square root of 397930090 is about 19948.1851304824. The cubic root of 397930090 is about 735.5331655286.

The spelling of 397930090 in words is "three hundred ninety-seven million, nine hundred thirty thousand, ninety".