11987172 has 36 divisors (see below), whose sum is σ = 30410380. Its totient is φ = 3981312.

The previous prime is 11987167. The next prime is 11987177. The reversal of 11987172 is 27178911.

It is an interprime number because it is at equal distance from previous prime (11987167) and next prime (11987177).

It can be written as a sum of positive squares in 2 ways, for example, as 2842596 + 9144576 = 1686^2 + 3024^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11987177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15204 + ... + 15972.

Almost surely, 2^11987172 is an apocalyptic number.

11987172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11987172 is an abundant number, since it is smaller than the sum of its proper divisors (18423208).

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

11987172 is a wasteful number, since it uses less digits than its factorization.

11987172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212 (or 1207 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 11987172 is about 3462.2495577298. The cubic root of 11987172 is about 228.8612394554.

The spelling of 11987172 in words is "eleven million, nine hundred eighty-seven thousand, one hundred seventy-two".