2640540 has 48 divisors (see below), whose sum is σ = 8451072. Its totient is φ = 603456.

The previous prime is 2640527. The next prime is 2640551. The reversal of 2640540 is 450462.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2724 + ... + 3563.

It is an arithmetic number, because the mean of its divisors is an integer number (176064).

2^2640540 is an apocalyptic number.

2640540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640540 is an abundant number, since it is smaller than the sum of its proper divisors (5810532).

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

2640540 is a wasteful number, since it uses less digits than its factorization.

2640540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6306 (or 6304 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 2640540 is about 1624.9738459434. The cubic root of 2640540 is about 138.2178872622.

The spelling of 2640540 in words is "two million, six hundred forty thousand, five hundred forty".