397281615990 has 32 divisors (see below), whose sum is σ = 1089686718720. Its totient is φ = 90807226464.

The previous prime is 397281615989. The next prime is 397281616009. The reversal of 397281615990 is 99516182793.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 945908400 + ... + 945908819.

It is an arithmetic number, because the mean of its divisors is an integer number (34052709960).

Almost surely, 2^397281615990 is an apocalyptic number.

397281615990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

397281615990 is an abundant number, since it is smaller than the sum of its proper divisors (692405102730).

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

397281615990 is a wasteful number, since it uses less digits than its factorization.

397281615990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891817236.

The product of its (nonzero) digits is 7348320, while the sum is 60.

The spelling of 397281615990 in words is "three hundred ninety-seven billion, two hundred eighty-one million, six hundred fifteen thousand, nine hundred ninety".