27929381 has 2 divisors, whose sum is σ = 27929382. Its totient is φ = 27929380.

The previous prime is 27929371. The next prime is 27929387. The reversal of 27929381 is 18392972.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25664356 + 2265025 = 5066^2 + 1505^2 .

It is a cyclic number.

It is not a de Polignac number, because 27929381 - 2¹⁰ = 27928357 is a prime.

It is a super-2 number, since 2×27929381² = 1560100646086322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27929387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13964690 + 13964691.

It is an arithmetic number, because the mean of its divisors is an integer number (13964691).

Almost surely, 2^27929381 is an apocalyptic number.

It is an amenable number.

27929381 is a deficient number, since it is larger than the sum of its proper divisors (1).

27929381 is an equidigital number, since it uses as much as digits as its factorization.

27929381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 27929381 is about 5284.8255411130. The cubic root of 27929381 is about 303.4033955083.

The spelling of 27929381 in words is "twenty-seven million, nine hundred twenty-nine thousand, three hundred eighty-one".