1275977940 has 24 divisors (see below), whose sum is σ = 3572738400. Its totient is φ = 340260768.

The previous prime is 1275977921. The next prime is 1275977947. The reversal of 1275977940 is 497795721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275977947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10633090 + ... + 10633209.

It is an arithmetic number, because the mean of its divisors is an integer number (148864100).

Almost surely, 2^1275977940 is an apocalyptic number.

1275977940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1275977940 is an abundant number, since it is smaller than the sum of its proper divisors (2296760460).

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

1275977940 is a wasteful number, since it uses less digits than its factorization.

1275977940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21266311 (or 21266309 counting only the distinct ones).

The product of its (nonzero) digits is 1111320, while the sum is 51.

The square root of 1275977940 is about 35720.8334169291. The cubic root of 1275977940 is about 1084.6286085452.

The spelling of 1275977940 in words is "one billion, two hundred seventy-five million, nine hundred seventy-seven thousand, nine hundred forty".