1397931885 has 64 divisors (see below), whose sum is σ = 2882764800. Its totient is φ = 629487936.

The previous prime is 1397931853. The next prime is 1397931889. The reversal of 1397931885 is 5881397931.

It is not a de Polignac number, because 1397931885 - 2⁵ = 1397931853 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397931889) 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 63 ways as a sum of consecutive naturals, for example, 52276 + ... + 74354.

It is an arithmetic number, because the mean of its divisors is an integer number (45043200).

Almost surely, 2^1397931885 is an apocalyptic number.

1397931885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1397931885 is an abundant number, since it is smaller than the sum of its proper divisors (1484832915).

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

1397931885 is a wasteful number, since it uses less digits than its factorization.

1397931885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22167 (or 22161 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 1397931885 is about 37388.9273047516. The cubic root of 1397931885 is about 1118.1378188571.

The spelling of 1397931885 in words is "one billion, three hundred ninety-seven million, nine hundred thirty-one thousand, eight hundred eighty-five".