12499981 has 16 divisors (see below), whose sum is σ = 14382144. Its totient is φ = 10761984.

The previous prime is 12499919. The next prime is 12499987. The reversal of 12499981 is 18999421.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12499981 - 2¹³ = 12491789 is a prime.

It is a super-2 number, since 2×12499981² = 312499050000722, which contains 22 as substring.

It is a Duffinian number.

12499981 is a Rhonda number in base 12.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12499987) 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, 35850 + ... + 36196.

It is an arithmetic number, because the mean of its divisors is an integer number (898884).

Almost surely, 2^12499981 is an apocalyptic number.

It is an amenable number.

12499981 is a deficient number, since it is larger than the sum of its proper divisors (1882163).

12499981 is a wasteful number, since it uses less digits than its factorization.

12499981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540.

The product of its digits is 46656, while the sum is 43.

The square root of 12499981 is about 3535.5312189259. The cubic root of 12499981 is about 232.0793240937.

The spelling of 12499981 in words is "twelve million, four hundred ninety-nine thousand, nine hundred eighty-one".