2738821 has 2 divisors, whose sum is σ = 2738822. Its totient is φ = 2738820.

The previous prime is 2738809. The next prime is 2738861. The reversal of 2738821 is 1288372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1718721 + 1020100 = 1311^2 + 1010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2738821 is a prime.

It is a super-2 number, since 2×2738821² = 15002280940082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2738861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1369410 + 1369411.

It is an arithmetic number, because the mean of its divisors is an integer number (1369411).

2^2738821 is an apocalyptic number.

It is an amenable number.

2738821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2738821 is an equidigital number, since it uses as much as digits as its factorization.

2738821 is an evil number, because the sum of its binary digits is even.

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

The square root of 2738821 is about 1654.9383674325. The cubic root of 2738821 is about 139.9118662979.

The spelling of 2738821 in words is "two million, seven hundred thirty-eight thousand, eight hundred twenty-one".