13749989 has 4 divisors (see below), whose sum is σ = 15000000. Its totient is φ = 12499980.

The previous prime is 13749971. The next prime is 13749997. The reversal of 13749989 is 98994731.

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 not a de Polignac number, because 13749989 - 2⁸ = 13749733 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 (13749959) 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, 624989 + ... + 625010.

It is an arithmetic number, because the mean of its divisors is an integer number (3750000).

Almost surely, 2^13749989 is an apocalyptic number.

It is an amenable number.

13749989 is a deficient number, since it is larger than the sum of its proper divisors (1250011).

13749989 is a wasteful number, since it uses less digits than its factorization.

13749989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250010.

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

The square root of 13749989 is about 3708.0977603078. The cubic root of 13749989 is about 239.5709289675.

The spelling of 13749989 in words is "thirteen million, seven hundred forty-nine thousand, nine hundred eighty-nine".