27990919 has 4 divisors (see below), whose sum is σ = 30535560. Its totient is φ = 25446280.

The previous prime is 27990917. The next prime is 27990929. The reversal of 27990919 is 91909972.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27990919 - 2¹ = 27990917 is a prime.

It is a super-2 number, since 2×27990919² = 1566983092929122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27990913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1272304 + ... + 1272325.

It is an arithmetic number, because the mean of its divisors is an integer number (7633890).

Almost surely, 2^27990919 is an apocalyptic number.

27990919 is a deficient number, since it is larger than the sum of its proper divisors (2544641).

27990919 is a wasteful number, since it uses less digits than its factorization.

27990919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544640.

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 27990919 is about 5290.6444787001. The cubic root of 27990919 is about 303.6260659422.

The spelling of 27990919 in words is "twenty-seven million, nine hundred ninety thousand, nine hundred nineteen".