11918728 has 8 divisors (see below), whose sum is σ = 22347630. Its totient is φ = 5959360.

The previous prime is 11918713. The next prime is 11918743. The reversal of 11918728 is 82781911.

It is an interprime number because it is at equal distance from previous prime (11918713) and next prime (11918743).

It can be written as a sum of positive squares in only one way, i.e., 10614564 + 1304164 = 3258^2 + 1142^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 744913 + ... + 744928.

Almost surely, 2^11918728 is an apocalyptic number.

It is an amenable number.

11918728 is a deficient number, since it is larger than the sum of its proper divisors (10428902).

11918728 is a wasteful number, since it uses less digits than its factorization.

11918728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489847 (or 1489843 counting only the distinct ones).

The product of its digits is 8064, while the sum is 37.

The square root of 11918728 is about 3452.3510829578. The cubic root of 11918728 is about 228.4248260806.

It can be divided in two parts, 119187 and 28, that multiplied together give a triangular number (3337236 = T₂₅₈₃).

The spelling of 11918728 in words is "eleven million, nine hundred eighteen thousand, seven hundred twenty-eight".