1297621920 has 144 divisors (see below), whose sum is σ = 4754943648. Its totient is φ = 296593920.

The previous prime is 1297621873. The next prime is 1297621957. The reversal of 1297621920 is 291267921.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4066 + ... + 51105.

It is an arithmetic number, because the mean of its divisors is an integer number (33020442).

Almost surely, 2^1297621920 is an apocalyptic number.

1297621920 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 1297621920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2377471824).

1297621920 is an abundant number, since it is smaller than the sum of its proper divisors (3457321728).

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

1297621920 is a wasteful number, since it uses less digits than its factorization.

1297621920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55203 (or 55188 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 1297621920 is about 36022.5196231469. The cubic root of 1297621920 is about 1090.7269846531.

The spelling of 1297621920 in words is "one billion, two hundred ninety-seven million, six hundred twenty-one thousand, nine hundred twenty".