13823991 has 12 divisors (see below), whose sum is σ = 20081880. Its totient is φ = 9163440.

The previous prime is 13823987. The next prime is 13824017. The reversal of 13823991 is 19932831.

It is not a de Polignac number, because 13823991 - 2² = 13823987 is a prime.

It is a super-2 number, since 2×13823991² = 382205454336162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13823921) 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, 2680 + ... + 5901.

It is an arithmetic number, because the mean of its divisors is an integer number (1673490).

Almost surely, 2^13823991 is an apocalyptic number.

13823991 is a deficient number, since it is larger than the sum of its proper divisors (6257889).

13823991 is a wasteful number, since it uses less digits than its factorization.

13823991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8766 (or 8763 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 13823991 is about 3718.0628020516. The cubic root of 13823991 is about 239.9999479167. Note that the first 4 decimals are identical.

The spelling of 13823991 in words is "thirteen million, eight hundred twenty-three thousand, nine hundred ninety-one".