12537381 has 16 divisors (see below), whose sum is σ = 18114624. Its totient is φ = 7682304.

The previous prime is 12537353. The next prime is 12537389. The reversal of 12537381 is 18373521.

It is not a de Polignac number, because 12537381 - 2⁷ = 12537253 is a prime.

It is a super-2 number, since 2×12537381² = 314371844678322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12537389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666 + ... + 5051.

It is an arithmetic number, because the mean of its divisors is an integer number (1132164).

Almost surely, 2^12537381 is an apocalyptic number.

It is an amenable number.

12537381 is a deficient number, since it is larger than the sum of its proper divisors (5577243).

12537381 is a wasteful number, since it uses less digits than its factorization.

12537381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5780.

The product of its digits is 5040, while the sum is 30.

The square root of 12537381 is about 3540.8164312768. The cubic root of 12537381 is about 232.3105544304.

The spelling of 12537381 in words is "twelve million, five hundred thirty-seven thousand, three hundred eighty-one".