1257107139 has 6 divisors (see below), whose sum is σ = 1815821436. Its totient is φ = 838071420.

The previous prime is 1257107123. The next prime is 1257107147. The reversal of 1257107139 is 9317017521.

1257107139 is a `hidden beast` number, since 12 + 571 + 0 + 71 + 3 + 9 = 666.

It is not a de Polignac number, because 1257107139 - 2⁴ = 1257107123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1257107119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69839277 + ... + 69839294.

It is an arithmetic number, because the mean of its divisors is an integer number (302636906).

Almost surely, 2^1257107139 is an apocalyptic number.

1257107139 is a deficient number, since it is larger than the sum of its proper divisors (558714297).

1257107139 is a wasteful number, since it uses less digits than its factorization.

1257107139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139678577 (or 139678574 counting only the distinct ones).

The product of its (nonzero) digits is 13230, while the sum is 36.

The square root of 1257107139 is about 35455.7067197934. The cubic root of 1257107139 is about 1079.2550701506.

The spelling of 1257107139 in words is "one billion, two hundred fifty-seven million, one hundred seven thousand, one hundred thirty-nine".