27161973 has 20 divisors (see below), whose sum is σ = 41155488. Its totient is φ = 17849160.

The previous prime is 27161969. The next prime is 27161989. The reversal of 27161973 is 37916172.

It is a happy number.

It is not a de Polignac number, because 27161973 - 2² = 27161969 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27161993) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3390 + ... + 8112.

Almost surely, 2^27161973 is an apocalyptic number.

It is an amenable number.

27161973 is a deficient number, since it is larger than the sum of its proper divisors (13993515).

27161973 is an equidigital number, since it uses as much as digits as its factorization.

27161973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4806 (or 4797 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 27161973 is about 5211.7149768574. The cubic root of 27161973 is about 300.5987043820.

The spelling of 27161973 in words is "twenty-seven million, one hundred sixty-one thousand, nine hundred seventy-three".