13991332 has 12 divisors (see below), whose sum is σ = 25082316. Its totient is φ = 6824960.

The previous prime is 13991309. The next prime is 13991333. The reversal of 13991332 is 23319931.

It can be written as a sum of positive squares in 2 ways, for example, as 8202496 + 5788836 = 2864^2 + 2406^2 .

It is a super-2 number, since 2×13991332² = 391514742268448, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13991294 and 13991303.

It is not an unprimeable number, because it can be changed into a prime (13991333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42493 + ... + 42820.

It is an arithmetic number, because the mean of its divisors is an integer number (2090193).

Almost surely, 2^13991332 is an apocalyptic number.

It is an amenable number.

13991332 is a deficient number, since it is larger than the sum of its proper divisors (11090984).

13991332 is a wasteful number, since it uses less digits than its factorization.

13991332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85358 (or 85356 counting only the distinct ones).

The product of its digits is 4374, while the sum is 31.

The square root of 13991332 is about 3740.4988972061. The cubic root of 13991332 is about 240.9644754029.

The spelling of 13991332 in words is "thirteen million, nine hundred ninety-one thousand, three hundred thirty-two".