1272125640 has 64 divisors (see below), whose sum is σ = 4040876160. Its totient is φ = 319278080.

The previous prime is 1272125633. The next prime is 1272125671. The reversal of 1272125640 is 465212721.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1272125598 and 1272125607.

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, 309756 + ... + 313835.

It is an arithmetic number, because the mean of its divisors is an integer number (63138690).

Almost surely, 2^1272125640 is an apocalyptic number.

1272125640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272125640 is an abundant number, since it is smaller than the sum of its proper divisors (2768750520).

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

1272125640 is a wasteful number, since it uses less digits than its factorization.

1272125640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623622 (or 623618 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 1272125640 is about 35666.8703420976. The cubic root of 1272125640 is about 1083.5359755574.

The spelling of 1272125640 in words is "one billion, two hundred seventy-two million, one hundred twenty-five thousand, six hundred forty".