12156690 has 128 divisors (see below), whose sum is σ = 36997632. Its totient is φ = 2488320.

The previous prime is 12156671. The next prime is 12156701. The reversal of 12156690 is 9665121.

It is a super-3 number, since 3×12156690³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 166494 + ... + 166566.

It is an arithmetic number, because the mean of its divisors is an integer number (289044).

Almost surely, 2^12156690 is an apocalyptic number.

12156690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12156690 is the 2847-th pentagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12156690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18498816).

12156690 is an abundant number, since it is smaller than the sum of its proper divisors (24840942).

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

12156690 is a wasteful number, since it uses less digits than its factorization.

12156690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 12156690 is about 3486.6445187314. The cubic root of 12156690 is about 229.9350162980.

The spelling of 12156690 in words is "twelve million, one hundred fifty-six thousand, six hundred ninety".