11919988 has 6 divisors (see below), whose sum is σ = 20859986. Its totient is φ = 5959992.

The previous prime is 11919983. The next prime is 11919989. The reversal of 11919988 is 88991911.

It can be written as a sum of positive squares in only one way, i.e., 6666724 + 5253264 = 2582^2 + 2292^2 .

It is a super-2 number, since 2×11919988² = 284172227840288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11919983) 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 as a sum of consecutive naturals, namely, 1489995 + ... + 1490002.

Almost surely, 2^11919988 is an apocalyptic number.

It is an amenable number.

11919988 is a deficient number, since it is larger than the sum of its proper divisors (8939998).

11919988 is a wasteful number, since it uses less digits than its factorization.

11919988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2980001 (or 2979999 counting only the distinct ones).

The product of its digits is 46656, while the sum is 46.

The square root of 11919988 is about 3452.5335624726. The cubic root of 11919988 is about 228.4328751817.

The spelling of 11919988 in words is "eleven million, nine hundred nineteen thousand, nine hundred eighty-eight".