12138972 has 24 divisors (see below), whose sum is σ = 28928256. Its totient is φ = 3960048.

The previous prime is 12138953. The next prime is 12138979. The reversal of 12138972 is 27983121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10198 + ... + 11325.

It is an arithmetic number, because the mean of its divisors is an integer number (1205344).

Almost surely, 2^12138972 is an apocalyptic number.

12138972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12138972 is an abundant number, since it is smaller than the sum of its proper divisors (16789284).

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

12138972 is a wasteful number, since it uses less digits than its factorization.

12138972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21577 (or 21575 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 12138972 is about 3484.1027539382. The cubic root of 12138972 is about 229.8232542569.

It can be divided in two parts, 121 and 38972, that added together give a palindrome (39093).

The spelling of 12138972 in words is "twelve million, one hundred thirty-eight thousand, nine hundred seventy-two".