12400539 has 4 divisors (see below), whose sum is σ = 16534056. Its totient is φ = 8267024.

The previous prime is 12400517. The next prime is 12400541. The reversal of 12400539 is 93500421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12400539 - 2¹⁶ = 12335003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12401539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2066754 + ... + 2066759.

It is an arithmetic number, because the mean of its divisors is an integer number (4133514).

Almost surely, 2^12400539 is an apocalyptic number.

12400539 is a deficient number, since it is larger than the sum of its proper divisors (4133517).

12400539 is an equidigital number, since it uses as much as digits as its factorization.

12400539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133516.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 12400539 is about 3521.4399043573. The cubic root of 12400539 is about 231.4622590693.

The spelling of 12400539 in words is "twelve million, four hundred thousand, five hundred thirty-nine".