18969156 has 36 divisors (see below), whose sum is σ = 48096412. Its totient is φ = 6303744.

The previous prime is 18969151. The next prime is 18969169. The reversal of 18969156 is 65196981.

It can be written as a sum of positive squares in 2 ways, for example, as 15729156 + 3240000 = 3966^2 + 1800^2 .

It is a tau number, because it is divible by the number of its divisors (36).

Its product of digits (116640) is a multiple of the sum of its prime factors (1620).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18969151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15876 + ... + 17028.

Almost surely, 2^18969156 is an apocalyptic number.

It is an amenable number.

18969156 is an abundant number, since it is smaller than the sum of its proper divisors (29127256).

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

18969156 is a wasteful number, since it uses less digits than its factorization.

18969156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620 (or 1615 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 18969156 is about 4355.3594570368. The cubic root of 18969156 is about 266.6956933681.

The spelling of 18969156 in words is "eighteen million, nine hundred sixty-nine thousand, one hundred fifty-six".