2857621 has 12 divisors (see below), whose sum is σ = 3184932. Its totient is φ = 2560896.

The previous prime is 2857609. The next prime is 2857633. The reversal of 2857621 is 1267582.

It is an interprime number because it is at equal distance from previous prime (2857609) and next prime (2857633).

It can be written as a sum of positive squares in 6 ways, for example, as 4900 + 2852721 = 70^2 + 1689^2 .

It is not a de Polignac number, because 2857621 - 2⁷ = 2857493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2857661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6025 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (265411).

2^2857621 is an apocalyptic number.

It is an amenable number.

2857621 is a deficient number, since it is larger than the sum of its proper divisors (327311).

2857621 is a wasteful number, since it uses less digits than its factorization.

2857621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 507 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 2857621 is about 1690.4499401047. The cubic root of 2857621 is about 141.9062563180.

The spelling of 2857621 in words is "two million, eight hundred fifty-seven thousand, six hundred twenty-one".