1272173540 has 24 divisors (see below), whose sum is σ = 2914434432. Its totient is φ = 462608480.

The previous prime is 1272173521. The next prime is 1272173561. The reversal of 1272173540 is 453712721.

It is a super-2 number, since 2×1272173540² = 3236851031752263200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1272173497 and 1272173506.

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, 2891084 + ... + 2891523.

It is an arithmetic number, because the mean of its divisors is an integer number (121434768).

Almost surely, 2^1272173540 is an apocalyptic number.

1272173540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272173540 is an abundant number, since it is smaller than the sum of its proper divisors (1642260892).

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

1272173540 is a wasteful number, since it uses less digits than its factorization.

1272173540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5782627 (or 5782625 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 1272173540 is about 35667.5418272692. The cubic root of 1272173540 is about 1083.5495750322.

The spelling of 1272173540 in words is "one billion, two hundred seventy-two million, one hundred seventy-three thousand, five hundred forty".