1257371990 has 16 divisors (see below), whose sum is σ = 2586593952. Its totient is φ = 431098944.

The previous prime is 1257371989. The next prime is 1257372031. The reversal of 1257371990 is 991737521.

It is a congruent number.

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, 8981159 + ... + 8981298.

It is an arithmetic number, because the mean of its divisors is an integer number (161662122).

Almost surely, 2^1257371990 is an apocalyptic number.

1257371990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1257371990 is an abundant number, since it is smaller than the sum of its proper divisors (1329221962).

1257371990 is a wasteful number, since it uses less digits than its factorization.

1257371990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17962471.

The product of its (nonzero) digits is 119070, while the sum is 44.

The square root of 1257371990 is about 35459.4414789630. The cubic root of 1257371990 is about 1079.3308583642.

The spelling of 1257371990 in words is "one billion, two hundred fifty-seven million, three hundred seventy-one thousand, nine hundred ninety".