1257320634 has 16 divisors (see below), whose sum is σ = 2515027872. Its totient is φ = 419042448.

The previous prime is 1257320627. The next prime is 1257320653. The reversal of 1257320634 is 4360237521.

It is a junction number, because it is equal to n+sod(n) for n = 1257320595 and 1257320604.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42672 + ... + 65844.

It is an arithmetic number, because the mean of its divisors is an integer number (157189242).

Almost surely, 2^1257320634 is an apocalyptic number.

1257320634 is an abundant number, since it is smaller than the sum of its proper divisors (1257707238).

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

1257320634 is a wasteful number, since it uses less digits than its factorization.

1257320634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32221.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 1257320634 is about 35458.7173202867. The cubic root of 1257320634 is about 1079.3161634633.

The spelling of 1257320634 in words is "one billion, two hundred fifty-seven million, three hundred twenty thousand, six hundred thirty-four".