11999838 has 16 divisors (see below), whose sum is σ = 24558336. Its totient is φ = 3906840.

The previous prime is 11999837. The next prime is 11999843. The reversal of 11999838 is 83899911.

It is a super-2 number, since 2×11999838² = 287992224052488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11999831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22998 + ... + 23513.

It is an arithmetic number, because the mean of its divisors is an integer number (1534896).

Almost surely, 2^11999838 is an apocalyptic number.

11999838 is an abundant number, since it is smaller than the sum of its proper divisors (12558498).

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

11999838 is a wasteful number, since it uses less digits than its factorization.

11999838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46559.

The product of its digits is 139968, while the sum is 48.

The square root of 11999838 is about 3464.0782323729. The cubic root of 11999838 is about 228.9418182632.

The spelling of 11999838 in words is "eleven million, nine hundred ninety-nine thousand, eight hundred thirty-eight".