1397320980 has 96 divisors (see below), whose sum is σ = 4275089280. Its totient is φ = 338196480.

The previous prime is 1397320943. The next prime is 1397320993. The reversal of 1397320980 is 890237931.

It is a super-2 number, since 2×1397320980² = 3905011842296320800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 532632 + ... + 535248.

It is an arithmetic number, because the mean of its divisors is an integer number (44532180).

Almost surely, 2^1397320980 is an apocalyptic number.

1397320980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1397320980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2137544640).

1397320980 is an abundant number, since it is smaller than the sum of its proper divisors (2877768300).

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

1397320980 is a wasteful number, since it uses less digits than its factorization.

1397320980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3449 (or 3447 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 1397320980 is about 37380.7568141684. The cubic root of 1397320980 is about 1117.9749173789.

The spelling of 1397320980 in words is "one billion, three hundred ninety-seven million, three hundred twenty thousand, nine hundred eighty".