27974389 has 2 divisors, whose sum is σ = 27974390. Its totient is φ = 27974388.

The previous prime is 27974377. The next prime is 27974399. The reversal of 27974389 is 98347972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21548164 + 6426225 = 4642^2 + 2535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27974389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27974399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13987194 + 13987195.

It is an arithmetic number, because the mean of its divisors is an integer number (13987195).

Almost surely, 2^27974389 is an apocalyptic number.

It is an amenable number.

27974389 is a deficient number, since it is larger than the sum of its proper divisors (1).

27974389 is an equidigital number, since it uses as much as digits as its factorization.

27974389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 49.

The square root of 27974389 is about 5289.0820564631. The cubic root of 27974389 is about 303.5662855164.

The spelling of 27974389 in words is "twenty-seven million, nine hundred seventy-four thousand, three hundred eighty-nine".