1247379957 has 12 divisors (see below), whose sum is σ = 1809312960. Its totient is φ = 828105768.

The previous prime is 1247379923. The next prime is 1247379961. The reversal of 1247379957 is 7599737421.

1247379957 is a `hidden beast` number, since 12 + 473 + 79 + 95 + 7 = 666.

It is not a de Polignac number, because 1247379957 - 2⁶ = 1247379893 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247379157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 287803 + ... + 292104.

It is an arithmetic number, because the mean of its divisors is an integer number (150776080).

Almost surely, 2^1247379957 is an apocalyptic number.

It is an amenable number.

1247379957 is a deficient number, since it is larger than the sum of its proper divisors (561933003).

1247379957 is a wasteful number, since it uses less digits than its factorization.

1247379957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580152 (or 580149 counting only the distinct ones).

The product of its digits is 3333960, while the sum is 54.

The square root of 1247379957 is about 35318.2666194138. The cubic root of 1247379957 is about 1076.4641903541.

The spelling of 1247379957 in words is "one billion, two hundred forty-seven million, three hundred seventy-nine thousand, nine hundred fifty-seven".