397729090 has 32 divisors (see below), whose sum is σ = 822104640. Its totient is φ = 137016000.

The previous prime is 397729081. The next prime is 397729099. The reversal of 397729090 is 90927793.

It is an interprime number because it is at equal distance from previous prime (397729081) and next prime (397729099).

It is a self number, because there is not a number n which added to its sum of digits gives 397729090.

It is not an unprimeable number, because it can be changed into a prime (397729099) 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, 93061 + ... + 97240.

It is an arithmetic number, because the mean of its divisors is an integer number (25690770).

Almost surely, 2^397729090 is an apocalyptic number.

397729090 is an abundant number, since it is smaller than the sum of its proper divisors (424375550).

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

397729090 is a wasteful number, since it uses less digits than its factorization.

397729090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190338.

The product of its (nonzero) digits is 214326, while the sum is 46.

The square root of 397729090 is about 19943.1464418231. The cubic root of 397729090 is about 735.4093020080.

The spelling of 397729090 in words is "three hundred ninety-seven million, seven hundred twenty-nine thousand, ninety".