12252139387 has 4 divisors (see below), whose sum is σ = 12252407200. Its totient is φ = 12251871576.

The previous prime is 12252139357. The next prime is 12252139433. The reversal of 12252139387 is 78393125221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12252139387 is a prime.

It is a super-2 number, since 2×12252139387² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12252139357) 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, 46083 + ... + 163180.

It is an arithmetic number, because the mean of its divisors is an integer number (3063101800).

Almost surely, 2^12252139387 is an apocalyptic number.

12252139387 is a deficient number, since it is larger than the sum of its proper divisors (267813).

12252139387 is an equidigital number, since it uses as much as digits as its factorization.

12252139387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267812.

The product of its digits is 181440, while the sum is 43.

The spelling of 12252139387 in words is "twelve billion, two hundred fifty-two million, one hundred thirty-nine thousand, three hundred eighty-seven".