2639924 has 18 divisors (see below), whose sum is σ = 5374530. Its totient is φ = 1131312.

The previous prime is 2639921. The next prime is 2639927. The reversal of 2639924 is 4299362.

It is an interprime number because it is at equal distance from previous prime (2639921) and next prime (2639927).

It can be written as a sum of positive squares in only one way, i.e., 2371600 + 268324 = 1540^2 + 518^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6539 + ... + 6930.

It is an arithmetic number, because the mean of its divisors is an integer number (298585).

2^2639924 is an apocalyptic number.

It is an amenable number.

2639924 is an abundant number, since it is smaller than the sum of its proper divisors (2734606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2639924 is a wasteful number, since it uses less digits than its factorization.

2639924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13487 (or 13478 counting only the distinct ones).

The product of its digits is 23328, while the sum is 35.

The square root of 2639924 is about 1624.7842933756. The cubic root of 2639924 is about 138.2071383447.

The spelling of 2639924 in words is "two million, six hundred thirty-nine thousand, nine hundred twenty-four".