1257449490 has 48 divisors (see below), whose sum is σ = 3566586816. Its totient is φ = 304836000.

The previous prime is 1257449449. The next prime is 1257449513. The reversal of 1257449490 is 949447521.

1257449490 is a `hidden beast` number, since 1 + 2 + 5 + 74 + 494 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 23 ways as a sum of consecutive naturals, for example, 634086 + ... + 636065.

It is an arithmetic number, because the mean of its divisors is an integer number (74303892).

Almost surely, 2^1257449490 is an apocalyptic number.

1257449490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1257449490 is an abundant number, since it is smaller than the sum of its proper divisors (2309137326).

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

1257449490 is a wasteful number, since it uses less digits than its factorization.

1257449490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270175 (or 1270172 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 1257449490 is about 35460.5342599347. The cubic root of 1257449490 is about 1079.3530332983.

The spelling of 1257449490 in words is "one billion, two hundred fifty-seven million, four hundred forty-nine thousand, four hundred ninety".