2640542 has 16 divisors (see below), whose sum is σ = 4309200. Its totient is φ = 1208448.

The previous prime is 2640527. The next prime is 2640551. The reversal of 2640542 is 2450462.

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, 209 + ... + 2307.

It is an arithmetic number, because the mean of its divisors is an integer number (269325).

2^2640542 is an apocalyptic number.

2640542 is a deficient number, since it is larger than the sum of its proper divisors (1668658).

2640542 is a wasteful number, since it uses less digits than its factorization.

2640542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 2640542 is about 1624.9744613378. The cubic root of 2640542 is about 138.2179221586.

Adding to 2640542 its product of nonzero digits (1920), we get a palindrome (2642462).

The spelling of 2640542 in words is "two million, six hundred forty thousand, five hundred forty-two".