12402540 has 36 divisors (see below), whose sum is σ = 37621584. Its totient is φ = 3307296.

The previous prime is 12402527. The next prime is 12402547. The reversal of 12402540 is 4520421.

12402540 is a `hidden beast` number, since 124 + 0 + 2 + 540 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12402547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34272 + ... + 34631.

It is an arithmetic number, because the mean of its divisors is an integer number (1045044).

Almost surely, 2^12402540 is an apocalyptic number.

12402540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12402540 is an abundant number, since it is smaller than the sum of its proper divisors (25219044).

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

12402540 is a wasteful number, since it uses less digits than its factorization.

12402540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68918 (or 68913 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 12402540 is about 3521.7240096294. The cubic root of 12402540 is about 231.4747082881.

Adding to 12402540 its reverse (4520421), we get a palindrome (16922961).

The spelling of 12402540 in words is "twelve million, four hundred two thousand, five hundred forty".