27982917 has 6 divisors (see below), whose sum is σ = 40419782. Its totient is φ = 18655272.

The previous prime is 27982909. The next prime is 27982949. The reversal of 27982917 is 71928972.

It can be written as a sum of positive squares in only one way, i.e., 26224641 + 1758276 = 5121^2 + 1326^2 .

It is not a de Polignac number, because 27982917 - 2³ = 27982909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27982967) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1554598 + ... + 1554615.

Almost surely, 2^27982917 is an apocalyptic number.

It is an amenable number.

27982917 is a deficient number, since it is larger than the sum of its proper divisors (12436865).

27982917 is a wasteful number, since it uses less digits than its factorization.

27982917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109219 (or 3109216 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 27982917 is about 5289.8881840735. Note that the first 3 decimals coincide. The cubic root of 27982917 is about 303.5971298036.

The spelling of 27982917 in words is "twenty-seven million, nine hundred eighty-two thousand, nine hundred seventeen".