27821929 has 2 divisors, whose sum is σ = 27821930. Its totient is φ = 27821928.

The previous prime is 27821887. The next prime is 27821939. The reversal of 27821929 is 92912872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19784704 + 8037225 = 4448^2 + 2835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27821929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27821891 and 27821900.

It is not a weakly prime, because it can be changed into another prime (27821939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13910964 + 13910965.

It is an arithmetic number, because the mean of its divisors is an integer number (13910965).

Almost surely, 2^27821929 is an apocalyptic number.

It is an amenable number.

27821929 is a deficient number, since it is larger than the sum of its proper divisors (1).

27821929 is an equidigital number, since it uses as much as digits as its factorization.

27821929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 27821929 is about 5274.6496566123. The cubic root of 27821929 is about 303.0138033918.

The spelling of 27821929 in words is "twenty-seven million, eight hundred twenty-one thousand, nine hundred twenty-nine".