13890749 has 2 divisors, whose sum is σ = 13890750. Its totient is φ = 13890748.

The previous prime is 13890743. The next prime is 13890769. The reversal of 13890749 is 94709831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8082649 + 5808100 = 2843^2 + 2410^2 .

It is an emirp because it is prime and its reverse (94709831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13890749 - 2⁴ = 13890733 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13890743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6945374 + 6945375.

It is an arithmetic number, because the mean of its divisors is an integer number (6945375).

Almost surely, 2^13890749 is an apocalyptic number.

It is an amenable number.

13890749 is a deficient number, since it is larger than the sum of its proper divisors (1).

13890749 is an equidigital number, since it uses as much as digits as its factorization.

13890749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 13890749 is about 3727.0295142378. The cubic root of 13890749 is about 240.3856588833.

The spelling of 13890749 in words is "thirteen million, eight hundred ninety thousand, seven hundred forty-nine".