27873981 has 12 divisors (see below), whose sum is σ = 40310400. Its totient is φ = 18560520.

The previous prime is 27873977. The next prime is 27874013. The reversal of 27873981 is 18937872.

It is not a de Polignac number, because 27873981 - 2² = 27873977 is a prime.

It is a super-2 number, since 2×27873981² = 1553917633576722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27877981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10420 + ... + 12818.

It is an arithmetic number, because the mean of its divisors is an integer number (3359200).

Almost surely, 2^27873981 is an apocalyptic number.

It is an amenable number.

27873981 is a deficient number, since it is larger than the sum of its proper divisors (12436419).

27873981 is a wasteful number, since it uses less digits than its factorization.

27873981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3696 (or 3693 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 27873981 is about 5279.5815175069. The cubic root of 27873981 is about 303.2026550044.

The spelling of 27873981 in words is "twenty-seven million, eight hundred seventy-three thousand, nine hundred eighty-one".