27951989 has 8 divisors (see below), whose sum is σ = 30143232. Its totient is φ = 25766640.

The previous prime is 27951967. The next prime is 27951991. The reversal of 27951989 is 98915972.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27951989 - 2⁸ = 27951733 is a prime.

It is a super-2 number, since 2×27951989² = 1562627378112242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27951929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17744 + ... + 19254.

It is an arithmetic number, because the mean of its divisors is an integer number (3767904).

Almost surely, 2^27951989 is an apocalyptic number.

It is an amenable number.

27951989 is a deficient number, since it is larger than the sum of its proper divisors (2191243).

27951989 is a wasteful number, since it uses less digits than its factorization.

27951989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2947.

The product of its digits is 408240, while the sum is 50.

The square root of 27951989 is about 5286.9640626734. The cubic root of 27951989 is about 303.4852387589.

The spelling of 27951989 in words is "twenty-seven million, nine hundred fifty-one thousand, nine hundred eighty-nine".