1257698412 has 36 divisors (see below), whose sum is σ = 3190441800. Its totient is φ = 417748032.

The previous prime is 1257698363. The next prime is 1257698417. The reversal of 1257698412 is 2148967521.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1257698417) 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, 51537 + ... + 71912.

Almost surely, 2^1257698412 is an apocalyptic number.

1257698412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1257698412 is an abundant number, since it is smaller than the sum of its proper divisors (1932743388).

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

1257698412 is a wasteful number, since it uses less digits than its factorization.

1257698412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123742 (or 123737 counting only the distinct ones).

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

The square root of 1257698412 is about 35464.0439318474. The cubic root of 1257698412 is about 1079.4242507351.

The spelling of 1257698412 in words is "one billion, two hundred fifty-seven million, six hundred ninety-eight thousand, four hundred twelve".