2640390 has 32 divisors (see below), whose sum is σ = 6379776. Its totient is φ = 699360.

The previous prime is 2640383. The next prime is 2640397. The reversal of 2640390 is 930462.

It is an interprime number because it is at equal distance from previous prime (2640383) and next prime (2640397).

It is a self number, because there is not a number n which added to its sum of digits gives 2640390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640397) 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 15 ways as a sum of consecutive naturals, for example, 8335 + ... + 8645.

It is an arithmetic number, because the mean of its divisors is an integer number (199368).

2^2640390 is an apocalyptic number.

2640390 is an abundant number, since it is smaller than the sum of its proper divisors (3739386).

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

2640390 is a wasteful number, since it uses less digits than its factorization.

2640390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 2640390 is about 1624.9276906989. The cubic root of 2640390 is about 138.2152699850.

The spelling of 2640390 in words is "two million, six hundred forty thousand, three hundred ninety".