13890381 has 8 divisors (see below), whose sum is σ = 18558144. Its totient is φ = 9241440.

The previous prime is 13890379. The next prime is 13890407. The reversal of 13890381 is 18309831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13890381 - 2¹ = 13890379 is a prime.

It is a super-2 number, since 2×13890381² = 385885368650322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13890301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2881 + ... + 6006.

It is an arithmetic number, because the mean of its divisors is an integer number (2319768).

Almost surely, 2^13890381 is an apocalyptic number.

It is an amenable number.

13890381 is a deficient number, since it is larger than the sum of its proper divisors (4667763).

13890381 is an equidigital number, since it uses as much as digits as its factorization.

13890381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9411.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 13890381 is about 3726.9801448358. The cubic root of 13890381 is about 240.3835360628.

The spelling of 13890381 in words is "thirteen million, eight hundred ninety thousand, three hundred eighty-one".