1257261730 has 64 divisors (see below), whose sum is σ = 2482099200. Its totient is φ = 456744960.

The previous prime is 1257261713. The next prime is 1257261751. The reversal of 1257261730 is 371627521.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 664626 + ... + 666514.

It is an arithmetic number, because the mean of its divisors is an integer number (38782800).

Almost surely, 2^1257261730 is an apocalyptic number.

1257261730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1257261730 is a deficient number, since it is larger than the sum of its proper divisors (1224837470).

1257261730 is a wasteful number, since it uses less digits than its factorization.

1257261730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2059.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 1257261730 is about 35457.8867108574. The cubic root of 1257261730 is about 1079.2993083004.

The spelling of 1257261730 in words is "one billion, two hundred fifty-seven million, two hundred sixty-one thousand, seven hundred thirty".