1397201980 has 24 divisors (see below), whose sum is σ = 2935007712. Its totient is φ = 558712512.

The previous prime is 1397201959. The next prime is 1397201989. The reversal of 1397201980 is 891027931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397201989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74209 + ... + 91111.

It is an arithmetic number, because the mean of its divisors is an integer number (122291988).

Almost surely, 2^1397201980 is an apocalyptic number.

1397201980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1397201980 is an abundant number, since it is smaller than the sum of its proper divisors (1537805732).

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

1397201980 is a wasteful number, since it uses less digits than its factorization.

1397201980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21045 (or 21043 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1397201980 is about 37379.1650522052. The cubic root of 1397201980 is about 1117.9431797911.

The spelling of 1397201980 in words is "one billion, three hundred ninety-seven million, two hundred one thousand, nine hundred eighty".