2720091 has 16 divisors (see below), whose sum is σ = 3991680. Its totient is φ = 1633920.

The previous prime is 2720089. The next prime is 2720101. The reversal of 2720091 is 1900272.

It is a happy number.

It is not a de Polignac number, because 2720091 - 2¹ = 2720089 is a prime.

2720091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2720071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4291 + ... + 4883.

It is an arithmetic number, because the mean of its divisors is an integer number (249480).

2^2720091 is an apocalyptic number.

2720091 is a deficient number, since it is larger than the sum of its proper divisors (1271589).

2720091 is a wasteful number, since it uses less digits than its factorization.

2720091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 2720091 is about 1649.2698384437. The cubic root of 2720091 is about 139.5921976302.

The spelling of 2720091 in words is "two million, seven hundred twenty thousand, ninety-one".