2858921 has 4 divisors (see below), whose sum is σ = 3078852. Its totient is φ = 2638992.

The previous prime is 2858903. The next prime is 2858927. The reversal of 2858921 is 1298582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1298582 = 2 ⋅649291.

It can be written as a sum of positive squares in 2 ways, for example, as 1466521 + 1392400 = 1211^2 + 1180^2 .

It is a cyclic number.

It is not a de Polignac number, because 2858921 - 2¹⁴ = 2842537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2858927) 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, 109946 + ... + 109971.

It is an arithmetic number, because the mean of its divisors is an integer number (769713).

2^2858921 is an apocalyptic number.

It is an amenable number.

2858921 is a deficient number, since it is larger than the sum of its proper divisors (219931).

2858921 is a wasteful number, since it uses less digits than its factorization.

2858921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219930.

The product of its digits is 11520, while the sum is 35.

The square root of 2858921 is about 1690.8344093967. The cubic root of 2858921 is about 141.9277719034.

The spelling of 2858921 in words is "two million, eight hundred fifty-eight thousand, nine hundred twenty-one".