2838721 has 2 divisors, whose sum is σ = 2838722. Its totient is φ = 2838720.

The previous prime is 2838713. The next prime is 2838727. The reversal of 2838721 is 1278382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1527696 + 1311025 = 1236^2 + 1145^2 .

It is a cyclic number.

It is not a de Polignac number, because 2838721 - 2³ = 2838713 is a prime.

It is not a weakly prime, because it can be changed into another prime (2838727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1419360 + 1419361.

It is an arithmetic number, because the mean of its divisors is an integer number (1419361).

2^2838721 is an apocalyptic number.

It is an amenable number.

2838721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2838721 is an equidigital number, since it uses as much as digits as its factorization.

2838721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

The square root of 2838721 is about 1684.8504384663. The cubic root of 2838721 is about 141.5927131120.

The spelling of 2838721 in words is "two million, eight hundred thirty-eight thousand, seven hundred twenty-one".