13890386 has 4 divisors (see below), whose sum is σ = 20835582. Its totient is φ = 6945192.

The previous prime is 13890379. The next prime is 13890407. The reversal of 13890386 is 68309831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68309831 = 1049 ⋅65119.

It can be written as a sum of positive squares in only one way, i.e., 7980625 + 5909761 = 2825^2 + 2431^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3472595 + ... + 3472598.

Almost surely, 2^13890386 is an apocalyptic number.

13890386 is a deficient number, since it is larger than the sum of its proper divisors (6945196).

13890386 is an equidigital number, since it uses as much as digits as its factorization.

13890386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6945195.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 13890386 is about 3726.9808156201. The cubic root of 13890386 is about 240.3835649057.

The spelling of 13890386 in words is "thirteen million, eight hundred ninety thousand, three hundred eighty-six".