1257492 has 24 divisors (see below), whose sum is σ = 3003616. Its totient is φ = 409248.

The previous prime is 1257491. The next prime is 1257493. The reversal of 1257492 is 2947521.

It is an interprime number because it is at equal distance from previous prime (1257491) and next prime (1257493).

It is a super-2 number, since 2×1257492² = 3162572260128, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703 + ... + 1734.

2^1257492 is an apocalyptic number.

1257492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1257492 is an abundant number, since it is smaller than the sum of its proper divisors (1746124).

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

1257492 is a wasteful number, since it uses less digits than its factorization.

1257492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487 (or 2485 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 1257492 is about 1121.3795075709. The cubic root of 1257492 is about 107.9365196220.

It can be divided in two parts, 125749 and 2, that added together give a triangular number (125751 = T₅₀₁).

The spelling of 1257492 in words is "one million, two hundred fifty-seven thousand, four hundred ninety-two".