1252840 has 16 divisors (see below), whose sum is σ = 2818980. Its totient is φ = 501120.

The previous prime is 1252819. The next prime is 1252843. The reversal of 1252840 is 482521.

It can be written as a sum of positive squares in 2 ways, for example, as 1249924 + 2916 = 1118^2 + 54^2 .

It is not an unprimeable number, because it can be changed into a prime (1252843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15621 + ... + 15700.

2^1252840 is an apocalyptic number.

1252840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1252840 is an abundant number, since it is smaller than the sum of its proper divisors (1566140).

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

1252840 is a wasteful number, since it uses less digits than its factorization.

1252840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31332 (or 31328 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1252840 is about 1119.3033547703. The cubic root of 1252840 is about 107.8032540555.

The spelling of 1252840 in words is "one million, two hundred fifty-two thousand, eight hundred forty".