27924821 has 2 divisors, whose sum is σ = 27924822. Its totient is φ = 27924820.

The previous prime is 27924779. The next prime is 27924823. The reversal of 27924821 is 12842972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26894596 + 1030225 = 5186^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 27924821 - 2¹⁴ = 27908437 is a prime.

Together with 27924823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27924823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13962410 + 13962411.

It is an arithmetic number, because the mean of its divisors is an integer number (13962411).

Almost surely, 2^27924821 is an apocalyptic number.

It is an amenable number.

27924821 is a deficient number, since it is larger than the sum of its proper divisors (1).

27924821 is an equidigital number, since it uses as much as digits as its factorization.

27924821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 27924821 is about 5284.3940996107. The cubic root of 27924821 is about 303.3868824942.

The spelling of 27924821 in words is "twenty-seven million, nine hundred twenty-four thousand, eight hundred twenty-one".