13979749 has 6 divisors (see below), whose sum is σ = 16262214. Its totient is φ = 11982600.

The previous prime is 13979743. The next prime is 13979753. The reversal of 13979749 is 94797931.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12496225 + 1483524 = 3535^2 + 1218^2 .

It is not a de Polignac number, because 13979749 - 2³ = 13979741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 285301 = 13979749 / (1 + 3 + 9 + 7 + 9 + 7 + 4 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13979741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142602 + ... + 142699.

It is an arithmetic number, because the mean of its divisors is an integer number (2710369).

Almost surely, 2^13979749 is an apocalyptic number.

It is an amenable number.

13979749 is a deficient number, since it is larger than the sum of its proper divisors (2282465).

13979749 is an equidigital number, since it uses as much as digits as its factorization.

13979749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285315 (or 285308 counting only the distinct ones).

The product of its digits is 428652, while the sum is 49.

The square root of 13979749 is about 3738.9502537477. The cubic root of 13979749 is about 240.8979613142.

The spelling of 13979749 in words is "thirteen million, nine hundred seventy-nine thousand, seven hundred forty-nine".