1257990 has 32 divisors (see below), whose sum is σ = 3179520. Its totient is φ = 317664.

The previous prime is 1257989. The next prime is 1258001. The reversal of 1257990 is 997521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 534 + ... + 1673.

It is an arithmetic number, because the mean of its divisors is an integer number (99360).

2^1257990 is an apocalyptic number.

1257990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1257990 is an abundant number, since it is smaller than the sum of its proper divisors (1921530).

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

1257990 is a wasteful number, since it uses less digits than its factorization.

1257990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 1257990 is about 1121.6015335225. The cubic root of 1257990 is about 107.9507663111.

The spelling of 1257990 in words is "one million, two hundred fifty-seven thousand, nine hundred ninety".