1251680 has 24 divisors (see below), whose sum is σ = 2957472. Its totient is φ = 500608.

The previous prime is 1251671. The next prime is 1251697. The reversal of 1251680 is 861521.

1251680 = T₄₀₁ + T₄₀₂ + ... + T₄₁₅.

It is a congruent number.

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, 3752 + ... + 4071.

It is an arithmetic number, because the mean of its divisors is an integer number (123228).

2^1251680 is an apocalyptic number.

1251680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251680 is an abundant number, since it is smaller than the sum of its proper divisors (1705792).

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

1251680 is an equidigital number, since it uses as much as digits as its factorization.

1251680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7838 (or 7830 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1251680 is about 1118.7850553167. The cubic root of 1251680 is about 107.7699722346.

The spelling of 1251680 in words is "one million, two hundred fifty-one thousand, six hundred eighty".