27421409 has 2 divisors, whose sum is σ = 27421410. Its totient is φ = 27421408.

The previous prime is 27421397. The next prime is 27421411. The reversal of 27421409 is 90412472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24010000 + 3411409 = 4900^2 + 1847^2 .

It is a cyclic number.

It is not a de Polignac number, because 27421409 - 2²⁰ = 26372833 is a prime.

Together with 27421411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27421439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13710704 + 13710705.

It is an arithmetic number, because the mean of its divisors is an integer number (13710705).

Almost surely, 2^27421409 is an apocalyptic number.

It is an amenable number.

27421409 is a deficient number, since it is larger than the sum of its proper divisors (1).

27421409 is an equidigital number, since it uses as much as digits as its factorization.

27421409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 27421409 is about 5236.5455216201. The cubic root of 27421409 is about 301.5527237061.

The spelling of 27421409 in words is "twenty-seven million, four hundred twenty-one thousand, four hundred nine".