1257294490 has 8 divisors (see below), whose sum is σ = 2263130100. Its totient is φ = 502917792.

The previous prime is 1257294439. The next prime is 1257294491. The reversal of 1257294490 is 944927521.

It can be written as a sum of positive squares in 2 ways, for example, as 1250117449 + 7177041 = 35357^2 + 2679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1257294491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62864715 + ... + 62864734.

Almost surely, 2^1257294490 is an apocalyptic number.

1257294490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1257294490 is a deficient number, since it is larger than the sum of its proper divisors (1005835610).

1257294490 is a wasteful number, since it uses less digits than its factorization.

1257294490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125729456.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 1257294490 is about 35458.3486643132. The cubic root of 1257294490 is about 1079.3086825189.

The spelling of 1257294490 in words is "one billion, two hundred fifty-seven million, two hundred ninety-four thousand, four hundred ninety".