1257375879 has 40 divisors (see below), whose sum is σ = 1997835840. Its totient is φ = 785355264.

The previous prime is 1257375839. The next prime is 1257375883. The reversal of 1257375879 is 9785737521.

It is a happy number.

1257375879 is a `hidden beast` number, since 1 + 2 + 57 + 3 + 7 + 587 + 9 = 666.

It is not a de Polignac number, because 1257375879 - 2¹⁹ = 1256851591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257375809) 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 39 ways as a sum of consecutive naturals, for example, 318882 + ... + 322800.

It is an arithmetic number, because the mean of its divisors is an integer number (49945896).

Almost surely, 2^1257375879 is an apocalyptic number.

1257375879 is a deficient number, since it is larger than the sum of its proper divisors (740459961).

1257375879 is a wasteful number, since it uses less digits than its factorization.

1257375879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4181 (or 4172 counting only the distinct ones).

The product of its digits is 3704400, while the sum is 54.

The square root of 1257375879 is about 35459.4963162197. The cubic root of 1257375879 is about 1079.3319711384.

The spelling of 1257375879 in words is "one billion, two hundred fifty-seven million, three hundred seventy-five thousand, eight hundred seventy-nine".