2820731 has 4 divisors (see below), whose sum is σ = 2868600. Its totient is φ = 2772864.

The previous prime is 2820709. The next prime is 2820733. The reversal of 2820731 is 1370282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1370282 = 2 ⋅685141.

It is a cyclic number.

It is not a de Polignac number, because 2820731 - 2⁶ = 2820667 is a prime.

It is a super-2 number, since 2×2820731² = 15913046748722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2820697 and 2820706.

It is not an unprimeable number, because it can be changed into a prime (2820733) 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, 23846 + ... + 23963.

It is an arithmetic number, because the mean of its divisors is an integer number (717150).

2^2820731 is an apocalyptic number.

2820731 is a deficient number, since it is larger than the sum of its proper divisors (47869).

2820731 is an equidigital number, since it uses as much as digits as its factorization.

2820731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47868.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2820731 is about 1679.5032003542. The cubic root of 2820731 is about 141.2929709760.

The spelling of 2820731 in words is "two million, eight hundred twenty thousand, seven hundred thirty-one".