13991472 has 120 divisors (see below), whose sum is σ = 43659408. Its totient is φ = 4181760.

The previous prime is 13991449. The next prime is 13991479. The reversal of 13991472 is 27419931.

It is a super-2 number, since 2×13991472² = 391522577453568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (13991479) 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 in 23 ways as a sum of consecutive naturals, for example, 191628 + ... + 191700.

Almost surely, 2^13991472 is an apocalyptic number.

13991472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13991472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21829704).

13991472 is an abundant number, since it is smaller than the sum of its proper divisors (29667936).

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

13991472 is a wasteful number, since it uses less digits than its factorization.

13991472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 89 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 13991472 is about 3740.5176112405. The cubic root of 13991472 is about 240.9652791127.

The spelling of 13991472 in words is "thirteen million, nine hundred ninety-one thousand, four hundred seventy-two".