2900721 has 4 divisors (see below), whose sum is σ = 3867632. Its totient is φ = 1933812.

The previous prime is 2900719. The next prime is 2900731. The reversal of 2900721 is 1270092.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2900721 - 2¹ = 2900719 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2900731) 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, 483451 + ... + 483456.

It is an arithmetic number, because the mean of its divisors is an integer number (966908).

2^2900721 is an apocalyptic number.

It is an amenable number.

2900721 is a deficient number, since it is larger than the sum of its proper divisors (966911).

2900721 is an equidigital number, since it uses as much as digits as its factorization.

2900721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966910.

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

The square root of 2900721 is about 1703.1503163256. The cubic root of 2900721 is about 142.6161318627.

The spelling of 2900721 in words is "two million, nine hundred thousand, seven hundred twenty-one".