2640623 has 4 divisors (see below), whose sum is σ = 2643888. Its totient is φ = 2637360.

The previous prime is 2640581. The next prime is 2640643. The reversal of 2640623 is 3260462.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2640623 - 2⁸ = 2640367 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590 + ... + 2372.

It is an arithmetic number, because the mean of its divisors is an integer number (660972).

2^2640623 is an apocalyptic number.

2640623 is a deficient number, since it is larger than the sum of its proper divisors (3265).

2640623 is a wasteful number, since it uses less digits than its factorization.

2640623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 2640623 is about 1624.9993846153. Note that the first 3 decimals coincide. The cubic root of 2640623 is about 138.2193354463.

The spelling of 2640623 in words is "two million, six hundred forty thousand, six hundred twenty-three".