27404981 has 2 divisors, whose sum is σ = 27404982. Its totient is φ = 27404980.

The previous prime is 27404963. The next prime is 27404989. The reversal of 27404981 is 18940472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17222500 + 10182481 = 4150^2 + 3191^2 .

It is a cyclic number.

It is not a de Polignac number, because 27404981 - 2⁶ = 27404917 is a prime.

It is a super-2 number, since 2×27404981² = 1502065967220722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27404989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13702490 + 13702491.

It is an arithmetic number, because the mean of its divisors is an integer number (13702491).

Almost surely, 2^27404981 is an apocalyptic number.

It is an amenable number.

27404981 is a deficient number, since it is larger than the sum of its proper divisors (1).

27404981 is an equidigital number, since it uses as much as digits as its factorization.

27404981 is an evil number, because the sum of its binary digits is even.

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

The square root of 27404981 is about 5234.9766952681. The cubic root of 27404981 is about 301.4924922064.

The spelling of 27404981 in words is "twenty-seven million, four hundred four thousand, nine hundred eighty-one".