2639240 has 16 divisors (see below), whose sum is σ = 5938380. Its totient is φ = 1055680.

The previous prime is 2639239. The next prime is 2639251. The reversal of 2639240 is 429362.

It can be written as a sum of positive squares in 2 ways, for example, as 2617924 + 21316 = 1618^2 + 146^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 32951 + ... + 33030.

2^2639240 is an apocalyptic number.

2639240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2639240 is an abundant number, since it is smaller than the sum of its proper divisors (3299140).

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

2639240 is a wasteful number, since it uses less digits than its factorization.

2639240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65992 (or 65988 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 2639240 is about 1624.5737902601. The cubic root of 2639240 is about 138.1952008989.

The spelling of 2639240 in words is "two million, six hundred thirty-nine thousand, two hundred forty".