2707921 has 2 divisors, whose sum is σ = 2707922. Its totient is φ = 2707920.

The previous prime is 2707909. The next prime is 2707931. The reversal of 2707921 is 1297072.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2624400 + 83521 = 1620^2 + 289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2707921 is a prime.

It is a super-2 number, since 2×2707921² = 14665672284482, which contains 22 as substring.

2707921 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2707921.

It is not a weakly prime, because it can be changed into another prime (2707931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1353960 + 1353961.

It is an arithmetic number, because the mean of its divisors is an integer number (1353961).

2^2707921 is an apocalyptic number.

It is an amenable number.

2707921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2707921 is an equidigital number, since it uses as much as digits as its factorization.

2707921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 2707921 is about 1645.5761908827. The cubic root of 2707921 is about 139.3837025272.

The spelling of 2707921 in words is "two million, seven hundred seven thousand, nine hundred twenty-one".