2721920 has 32 divisors (see below), whose sum is σ = 6508620. Its totient is φ = 1088512.

The previous prime is 2721913. The next prime is 2721947. The reversal of 2721920 is 291272.

It can be written as a sum of positive squares in 2 ways, for example, as 2483776 + 238144 = 1576^2 + 488^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1487 + ... + 2766.

2^2721920 is an apocalyptic number.

2721920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2721920 is an abundant number, since it is smaller than the sum of its proper divisors (3786700).

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

2721920 is an equidigital number, since it uses as much as digits as its factorization.

2721920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4272 (or 4260 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 2721920 is about 1649.8242330624. The cubic root of 2721920 is about 139.6234780697.

The spelling of 2721920 in words is "two million, seven hundred twenty-one thousand, nine hundred twenty".