2640838 has 16 divisors (see below), whose sum is σ = 4114944. Its totient is φ = 1270080.

The previous prime is 2640823. The next prime is 2640853. The reversal of 2640838 is 8380462.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2640823) and next prime (2640853).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9258 + ... + 9538.

It is an arithmetic number, because the mean of its divisors is an integer number (257184).

2^2640838 is an apocalyptic number.

2640838 is a deficient number, since it is larger than the sum of its proper divisors (1474106).

2640838 is a wasteful number, since it uses less digits than its factorization.

2640838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 2640838 is about 1625.0655371400. The cubic root of 2640838 is about 138.2230866256.

The spelling of 2640838 in words is "two million, six hundred forty thousand, eight hundred thirty-eight".