13890437 has 6 divisors (see below), whose sum is σ = 15268134. Its totient is φ = 12627560.

The previous prime is 13890433. The next prime is 13890439. The reversal of 13890437 is 73409831.

It can be written as a sum of positive squares in only one way, i.e., 8755681 + 5134756 = 2959^2 + 2266^2 .

It is not a de Polignac number, because 13890437 - 2² = 13890433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13890397 and 13890406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13890433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57278 + ... + 57519.

It is an arithmetic number, because the mean of its divisors is an integer number (2544689).

Almost surely, 2^13890437 is an apocalyptic number.

It is an amenable number.

13890437 is a deficient number, since it is larger than the sum of its proper divisors (1377697).

13890437 is a wasteful number, since it uses less digits than its factorization.

13890437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114819 (or 114808 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 13890437 is about 3726.9876576130. The cubic root of 13890437 is about 240.3838591031.

The spelling of 13890437 in words is "thirteen million, eight hundred ninety thousand, four hundred thirty-seven".