2639765 has 16 divisors (see below), whose sum is σ = 3429120. Its totient is φ = 1944000.

The previous prime is 2639761. The next prime is 2639773. The reversal of 2639765 is 5679362.

It is not a de Polignac number, because 2639765 - 2² = 2639761 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3140 + ... + 3890.

It is an arithmetic number, because the mean of its divisors is an integer number (214320).

2^2639765 is an apocalyptic number.

It is an amenable number.

2639765 is a deficient number, since it is larger than the sum of its proper divisors (789355).

2639765 is a wasteful number, since it uses less digits than its factorization.

2639765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812.

The product of its digits is 68040, while the sum is 38.

The square root of 2639765 is about 1624.7353630669. The cubic root of 2639765 is about 138.2043635961.

It can be divided in two parts, 26397 and 65, that added together give a palindrome (26462).

The spelling of 2639765 in words is "two million, six hundred thirty-nine thousand, seven hundred sixty-five".