1297688380 has 48 divisors (see below), whose sum is σ = 2784821760. Its totient is φ = 507801600.

The previous prime is 1297688339. The next prime is 1297688393. The reversal of 1297688380 is 838867921.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230236 + ... + 235804.

It is an arithmetic number, because the mean of its divisors is an integer number (58017120).

Almost surely, 2^1297688380 is an apocalyptic number.

1297688380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1297688380 is an abundant number, since it is smaller than the sum of its proper divisors (1487133380).

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

1297688380 is a wasteful number, since it uses less digits than its factorization.

1297688380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5830 (or 5828 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 1297688380 is about 36023.4420898392. The cubic root of 1297688380 is about 1090.7456055052.

The spelling of 1297688380 in words is "one billion, two hundred ninety-seven million, six hundred eighty-eight thousand, three hundred eighty".