13899749 has 4 divisors (see below), whose sum is σ = 14348160. Its totient is φ = 13451340.

The previous prime is 13899737. The next prime is 13899757. The reversal of 13899749 is 94799831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13899749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13899697 and 13899706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13899799) 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 3 ways as a sum of consecutive naturals, for example, 224159 + ... + 224220.

It is an arithmetic number, because the mean of its divisors is an integer number (3587040).

Almost surely, 2^13899749 is an apocalyptic number.

It is an amenable number.

13899749 is a deficient number, since it is larger than the sum of its proper divisors (448411).

13899749 is an equidigital number, since it uses as much as digits as its factorization.

13899749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448410.

The product of its digits is 489888, while the sum is 50.

The square root of 13899749 is about 3728.2367145877. The cubic root of 13899749 is about 240.4375640242.

The spelling of 13899749 in words is "thirteen million, eight hundred ninety-nine thousand, seven hundred forty-nine".