13889945 has 8 divisors (see below), whose sum is σ = 16687944. Its totient is φ = 11098624.

The previous prime is 13889933. The next prime is 13889951. The reversal of 13889945 is 54998831.

It can be written as a sum of positive squares in 4 ways, for example, as 1308736 + 12581209 = 1144^2 + 3547^2 .

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 13889945 - 2⁶ = 13889881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13889945.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7337 + ... + 9033.

It is an arithmetic number, because the mean of its divisors is an integer number (2085993).

Almost surely, 2^13889945 is an apocalyptic number.

It is an amenable number.

13889945 is a deficient number, since it is larger than the sum of its proper divisors (2797999).

13889945 is a wasteful number, since it uses less digits than its factorization.

13889945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3339.

The product of its digits is 311040, while the sum is 47.

The square root of 13889945 is about 3726.9216519804. The cubic root of 13889945 is about 240.3810209333.

The spelling of 13889945 in words is "thirteen million, eight hundred eighty-nine thousand, nine hundred forty-five".