2636389 has 4 divisors (see below), whose sum is σ = 3013024. Its totient is φ = 2259756.

The previous prime is 2636369. The next prime is 2636401. The reversal of 2636389 is 9836362.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2636389 - 2⁵ = 2636357 is a prime.

It is a d-powerful number, because it can be written as 2 + 6 + 3 + 6⁵ + 3¹² + 8⁷ + 9 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2636339) 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, 188307 + ... + 188320.

It is an arithmetic number, because the mean of its divisors is an integer number (753256).

2^2636389 is an apocalyptic number.

It is an amenable number.

2636389 is a deficient number, since it is larger than the sum of its proper divisors (376635).

2636389 is an equidigital number, since it uses as much as digits as its factorization.

2636389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376634.

The product of its digits is 46656, while the sum is 37.

The square root of 2636389 is about 1623.6960922537. The cubic root of 2636389 is about 138.1454218626.

It can be divided in two parts, 2636 and 389, that added together give a square (3025 = 55²).

The spelling of 2636389 in words is "two million, six hundred thirty-six thousand, three hundred eighty-nine".