13749991 has 8 divisors (see below), whose sum is σ = 14869440. Its totient is φ = 12665088.

The previous prime is 13749971. The next prime is 13749997. The reversal of 13749991 is 19994731.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13749991 - 2⁵ = 13749959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13749997) 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, 7806 + ... + 9403.

It is an arithmetic number, because the mean of its divisors is an integer number (1858680).

Almost surely, 2^13749991 is an apocalyptic number.

13749991 is a deficient number, since it is larger than the sum of its proper divisors (1119449).

13749991 is a wasteful number, since it uses less digits than its factorization.

13749991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17273.

The product of its digits is 61236, while the sum is 43.

The square root of 13749991 is about 3708.0980299879. The cubic root of 13749991 is about 239.5709405831.

The spelling of 13749991 in words is "thirteen million, seven hundred forty-nine thousand, nine hundred ninety-one".