1275981642 has 48 divisors (see below), whose sum is σ = 2980897920. Its totient is φ = 392134176.

The previous prime is 1275981611. The next prime is 1275981661. The reversal of 1275981642 is 2461895721.

1275981642 is a `hidden beast` number, since 1 + 2 + 7 + 598 + 16 + 42 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 223459 + ... + 229097.

It is an arithmetic number, because the mean of its divisors is an integer number (62102040).

Almost surely, 2^1275981642 is an apocalyptic number.

1275981642 is an abundant number, since it is smaller than the sum of its proper divisors (1704916278).

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

1275981642 is a wasteful number, since it uses less digits than its factorization.

1275981642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6627 (or 6624 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 1275981642 is about 35720.8852353914. The cubic root of 1275981642 is about 1084.6296574900.

The spelling of 1275981642 in words is "one billion, two hundred seventy-five million, nine hundred eighty-one thousand, six hundred forty-two".