1257263916 has 12 divisors (see below), whose sum is σ = 2933615832. Its totient is φ = 419087968.

The previous prime is 1257263867. The next prime is 1257263921. The reversal of 1257263916 is 6193627521.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52385985 + ... + 52386008.

It is an arithmetic number, because the mean of its divisors is an integer number (244467986).

Almost surely, 2^1257263916 is an apocalyptic number.

It is an amenable number.

1257263916 is an abundant number, since it is smaller than the sum of its proper divisors (1676351916).

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

1257263916 is a wasteful number, since it uses less digits than its factorization.

1257263916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104772000 (or 104771998 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 1257263916 is about 35457.9175361442. The cubic root of 1257263916 is about 1079.2999338257.

The spelling of 1257263916 in words is "one billion, two hundred fifty-seven million, two hundred sixty-three thousand, nine hundred sixteen".