397993625887 has 32 divisors (see below), whose sum is σ = 483915749184. Its totient is φ = 322475212800.

The previous prime is 397993625839. The next prime is 397993625923. The reversal of 397993625887 is 788526399793.

It is not a de Polignac number, because 397993625887 - 2⁷ = 397993625759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397993625837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218803 + ... + 918619.

It is an arithmetic number, because the mean of its divisors is an integer number (15122367162).

Almost surely, 2^397993625887 is an apocalyptic number.

397993625887 is a deficient number, since it is larger than the sum of its proper divisors (85922123297).

397993625887 is a wasteful number, since it uses less digits than its factorization.

397993625887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699979.

The product of its digits is 1234517760, while the sum is 76.

The spelling of 397993625887 in words is "three hundred ninety-seven billion, nine hundred ninety-three million, six hundred twenty-five thousand, eight hundred eighty-seven".