1252640 has 24 divisors (see below), whose sum is σ = 2959740. Its totient is φ = 500992.

The previous prime is 1252639. The next prime is 1252661. The reversal of 1252640 is 462521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1157776 + 94864 = 1076^2 + 308^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3755 + ... + 4074.

2^1252640 is an apocalyptic number.

1252640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1252640 is an abundant number, since it is smaller than the sum of its proper divisors (1707100).

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

1252640 is an equidigital number, since it uses as much as digits as its factorization.

1252640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7844 (or 7836 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1252640 is about 1119.2140099195. The cubic root of 1252640 is about 107.7975172766.

The spelling of 1252640 in words is "one million, two hundred fifty-two thousand, six hundred forty".