1272794140 has 12 divisors (see below), whose sum is σ = 2672867736. Its totient is φ = 509117648.

The previous prime is 1272794129. The next prime is 1272794147. The reversal of 1272794140 is 414972721.

It is a self number, because there is not a number n which added to its sum of digits gives 1272794140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272794147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31819834 + ... + 31819873.

It is an arithmetic number, because the mean of its divisors is an integer number (222738978).

Almost surely, 2^1272794140 is an apocalyptic number.

1272794140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272794140 is an abundant number, since it is smaller than the sum of its proper divisors (1400073596).

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

1272794140 is a wasteful number, since it uses less digits than its factorization.

1272794140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63639716 (or 63639714 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 1272794140 is about 35676.2405530628. The cubic root of 1272794140 is about 1083.7257411312.

The spelling of 1272794140 in words is "one billion, two hundred seventy-two million, seven hundred ninety-four thousand, one hundred forty".