2621904 has 20 divisors (see below), whose sum is σ = 6773376. Its totient is φ = 873952.

The previous prime is 2621903. The next prime is 2621917. The reversal of 2621904 is 4091262.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621903) 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, 27264 + ... + 27359.

2^2621904 is an apocalyptic number.

2621904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2621904 is an abundant number, since it is smaller than the sum of its proper divisors (4151472).

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

2621904 is a wasteful number, since it uses less digits than its factorization.

2621904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54634 (or 54628 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 2621904 is about 1619.2294463726. The cubic root of 2621904 is about 137.8919549173.

The spelling of 2621904 in words is "two million, six hundred twenty-one thousand, nine hundred four".