2727991 has 4 divisors (see below), whose sum is σ = 3117712. Its totient is φ = 2338272.

The previous prime is 2727979. The next prime is 2727997. The reversal of 2727991 is 1997272.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2727991 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 2727991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2727997) 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, 194850 + ... + 194863.

It is an arithmetic number, because the mean of its divisors is an integer number (779428).

2^2727991 is an apocalyptic number.

2727991 is a deficient number, since it is larger than the sum of its proper divisors (389721).

2727991 is an equidigital number, since it uses as much as digits as its factorization.

2727991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389720.

The product of its digits is 15876, while the sum is 37.

The square root of 2727991 is about 1651.6631012407. The cubic root of 2727991 is about 139.7272068971.

The spelling of 2727991 in words is "two million, seven hundred twenty-seven thousand, nine hundred ninety-one".