1257448465 has 16 divisors (see below), whose sum is σ = 1857155328. Its totient is φ = 795923136.

The previous prime is 1257448459. The next prime is 1257448477. The reversal of 1257448465 is 5648447521.

It is a cyclic number.

It is not a de Polignac number, because 1257448465 - 2⁹ = 1257447953 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 1381357 + ... + 1382266.

It is an arithmetic number, because the mean of its divisors is an integer number (116072208).

Almost surely, 2^1257448465 is an apocalyptic number.

It is an amenable number.

1257448465 is a deficient number, since it is larger than the sum of its proper divisors (599706863).

1257448465 is a wasteful number, since it uses less digits than its factorization.

1257448465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763648.

The product of its digits is 1075200, while the sum is 46.

The square root of 1257448465 is about 35460.5198072448. The cubic root of 1257448465 is about 1079.3527400228.

The spelling of 1257448465 in words is "one billion, two hundred fifty-seven million, four hundred forty-eight thousand, four hundred sixty-five".