2640738 has 16 divisors (see below), whose sum is σ = 5361120. Its totient is φ = 866976.

The previous prime is 2640721. The next prime is 2640739. The reversal of 2640738 is 8370462.

It is a d-powerful number, because it can be written as 2¹³ + 6⁴ + 4⁴ + 0 + 7⁴ + 3¹² + 8⁷ .

It is not an unprimeable number, because it can be changed into a prime (2640739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2883 + ... + 3686.

It is an arithmetic number, because the mean of its divisors is an integer number (335070).

2^2640738 is an apocalyptic number.

2640738 is an abundant number, since it is smaller than the sum of its proper divisors (2720382).

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

2640738 is a wasteful number, since it uses less digits than its factorization.

2640738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6641.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 2640738 is about 1625.0347688588. The cubic root of 2640738 is about 138.2213419164.

The spelling of 2640738 in words is "two million, six hundred forty thousand, seven hundred thirty-eight".