12699918 has 144 divisors (see below), whose sum is σ = 37346400. Its totient is φ = 3104640.

The previous prime is 12699899. The next prime is 12699931. The reversal of 12699918 is 81999621.

It is a super-2 number, since 2×12699918² = 322575834413448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 747046 + ... + 747062.

It is an arithmetic number, because the mean of its divisors is an integer number (259350).

Almost surely, 2^12699918 is an apocalyptic number.

12699918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12699918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18673200).

12699918 is an abundant number, since it is smaller than the sum of its proper divisors (24646482).

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

12699918 is a wasteful number, since it uses less digits than its factorization.

12699918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 40 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 12699918 is about 3563.6944313451. The cubic root of 12699918 is about 233.3101532528.

The spelling of 12699918 in words is "twelve million, six hundred ninety-nine thousand, nine hundred eighteen".