1272993840 has 80 divisors (see below), whose sum is σ = 4384764000. Its totient is φ = 339464448.

The previous prime is 1272993833. The next prime is 1272993859. The reversal of 1272993840 is 483992721.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 292515 + ... + 296834.

It is an arithmetic number, because the mean of its divisors is an integer number (54809550).

Almost surely, 2^1272993840 is an apocalyptic number.

1272993840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272993840 is an abundant number, since it is smaller than the sum of its proper divisors (3111770160).

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

1272993840 is a wasteful number, since it uses less digits than its factorization.

1272993840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589371 (or 589359 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1272993840 is about 35679.0392247325. The cubic root of 1272993840 is about 1083.7824166259.

The spelling of 1272993840 in words is "one billion, two hundred seventy-two million, nine hundred ninety-three thousand, eight hundred forty".