1297865808 has 40 divisors (see below), whose sum is σ = 3725356800. Its totient is φ = 432621792.

The previous prime is 1297865791. The next prime is 1297865869. The reversal of 1297865808 is 8085687921.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1501728 + ... + 1502591.

It is an arithmetic number, because the mean of its divisors is an integer number (93133920).

Almost surely, 2^1297865808 is an apocalyptic number.

1297865808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1297865808 is an abundant number, since it is smaller than the sum of its proper divisors (2427490992).

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

1297865808 is a wasteful number, since it uses less digits than its factorization.

1297865808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004336 (or 3004324 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The square root of 1297865808 is about 36025.9046798273. The cubic root of 1297865808 is about 1090.7953144068.

The spelling of 1297865808 in words is "one billion, two hundred ninety-seven million, eight hundred sixty-five thousand, eight hundred eight".