2720905 has 16 divisors (see below), whose sum is σ = 3624768. Its totient is φ = 1944000.

The previous prime is 2720899. The next prime is 2720917. The reversal of 2720905 is 5090272.

It is not a de Polignac number, because 2720905 - 2³ = 2720897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2720905.

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, 2950 + ... + 3760.

It is an arithmetic number, because the mean of its divisors is an integer number (226548).

2^2720905 is an apocalyptic number.

It is an amenable number.

2720905 is a deficient number, since it is larger than the sum of its proper divisors (903863).

2720905 is a wasteful number, since it uses less digits than its factorization.

2720905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 2720905 is about 1649.5165958547. The cubic root of 2720905 is about 139.6061207815.

The spelling of 2720905 in words is "two million, seven hundred twenty thousand, nine hundred five".