11390639 has 4 divisors (see below), whose sum is σ = 12266856. Its totient is φ = 10514424.

The previous prime is 11390593. The next prime is 11390641. The reversal of 11390639 is 93609311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93609311 = 71 ⋅1318441.

It is a cyclic number.

It is not a de Polignac number, because 11390639 - 2¹⁶ = 11325103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11390669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438089 + ... + 438114.

It is an arithmetic number, because the mean of its divisors is an integer number (3066714).

Almost surely, 2^11390639 is an apocalyptic number.

11390639 is a deficient number, since it is larger than the sum of its proper divisors (876217).

11390639 is an equidigital number, since it uses as much as digits as its factorization.

11390639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876216.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 11390639 is about 3375.0020740734. The cubic root of 11390639 is about 225.0000921810. Note that the first 4 decimals are identical.

The spelling of 11390639 in words is "eleven million, three hundred ninety thousand, six hundred thirty-nine".