12461840 has 20 divisors (see below), whose sum is σ = 28973964. Its totient is φ = 4984704.

The previous prime is 12461831. The next prime is 12461887. The reversal of 12461840 is 4816421.

It can be written as a sum of positive squares in 2 ways, for example, as 3794704 + 8667136 = 1948^2 + 2944^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

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, 77807 + ... + 77966.

Almost surely, 2^12461840 is an apocalyptic number.

12461840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12461840 is an abundant number, since it is smaller than the sum of its proper divisors (16512124).

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

12461840 is a wasteful number, since it uses less digits than its factorization.

12461840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155786 (or 155780 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 12461840 is about 3530.1331419650. The cubic root of 12461840 is about 231.8430369118.

The spelling of 12461840 in words is "twelve million, four hundred sixty-one thousand, eight hundred forty".