2820457 has 4 divisors (see below), whose sum is σ = 2866756. Its totient is φ = 2774160.

The previous prime is 2820407. The next prime is 2820479. The reversal of 2820457 is 7540282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1390041 + 1430416 = 1179^2 + 1196^2 .

It is a cyclic number.

It is not a de Polignac number, because 2820457 - 2¹⁵ = 2787689 is a prime.

2820457 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2820407) 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, 23058 + ... + 23179.

It is an arithmetic number, because the mean of its divisors is an integer number (716689).

2^2820457 is an apocalyptic number.

It is an amenable number.

2820457 is a deficient number, since it is larger than the sum of its proper divisors (46299).

2820457 is an equidigital number, since it uses as much as digits as its factorization.

2820457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46298.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 2820457 is about 1679.4216266322. The cubic root of 2820457 is about 141.2883958584.

The spelling of 2820457 in words is "two million, eight hundred twenty thousand, four hundred fifty-seven".