2830921 has 2 divisors, whose sum is σ = 2830922. Its totient is φ = 2830920.

The previous prime is 2830913. The next prime is 2830937. The reversal of 2830921 is 1290382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2368521 + 462400 = 1539^2 + 680^2 .

It is a cyclic number.

It is not a de Polignac number, because 2830921 - 2³ = 2830913 is a prime.

It is a super-2 number, since 2×2830921² = 16028227416482, which contains 22 as substring.

2830921 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2833921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1415460 + 1415461.

It is an arithmetic number, because the mean of its divisors is an integer number (1415461).

2^2830921 is an apocalyptic number.

It is an amenable number.

2830921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2830921 is an equidigital number, since it uses as much as digits as its factorization.

2830921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 2830921 is about 1682.5341006945. The cubic root of 2830921 is about 141.4629086148.

The spelling of 2830921 in words is "two million, eight hundred thirty thousand, nine hundred twenty-one".