2640394 has 16 divisors (see below), whose sum is σ = 4202496. Its totient is φ = 1242000.

The previous prime is 2640383. The next prime is 2640397. The reversal of 2640394 is 4930462.

2640394 = T₁₁₀ + T₁₁₁ + ... + T₂₅₇.

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 7 ways as a sum of consecutive naturals, for example, 1719 + ... + 2869.

It is an arithmetic number, because the mean of its divisors is an integer number (262656).

2^2640394 is an apocalyptic number.

2640394 is a deficient number, since it is larger than the sum of its proper divisors (1562102).

2640394 is a wasteful number, since it uses less digits than its factorization.

2640394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 2640394 is about 1624.9289215224. The cubic root of 2640394 is about 138.2153397803.

The spelling of 2640394 in words is "two million, six hundred forty thousand, three hundred ninety-four".