1257438495 has 16 divisors (see below), whose sum is σ = 2016558432. Its totient is φ = 669081600.

The previous prime is 1257438491. The next prime is 1257438509. The reversal of 1257438495 is 5948347521.

It is not a de Polignac number, because 1257438495 - 2² = 1257438491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257438491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90306 + ... + 103295.

It is an arithmetic number, because the mean of its divisors is an integer number (126034902).

Almost surely, 2^1257438495 is an apocalyptic number.

1257438495 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1257438495 is a deficient number, since it is larger than the sum of its proper divisors (759119937).

1257438495 is a wasteful number, since it uses less digits than its factorization.

1257438495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194042.

The product of its digits is 1209600, while the sum is 48.

The square root of 1257438495 is about 35460.3792280906. The cubic root of 1257438495 is about 1079.3498873744.

The spelling of 1257438495 in words is "one billion, two hundred fifty-seven million, four hundred thirty-eight thousand, four hundred ninety-five".