27129973 has 8 divisors (see below), whose sum is σ = 29432088. Its totient is φ = 24858624.

The previous prime is 27129931. The next prime is 27129979. The reversal of 27129973 is 37992172.

It can be written as a sum of positive squares in 4 ways, for example, as 69169 + 27060804 = 263^2 + 5202^2 .

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 27129973 - 2¹³ = 27121781 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 (27129979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5836 + ... + 9397.

It is an arithmetic number, because the mean of its divisors is an integer number (3679011).

Almost surely, 2^27129973 is an apocalyptic number.

It is an amenable number.

27129973 is a deficient number, since it is larger than the sum of its proper divisors (2302115).

27129973 is a wasteful number, since it uses less digits than its factorization.

27129973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15383.

The product of its digits is 47628, while the sum is 40.

The square root of 27129973 is about 5208.6440653974. The cubic root of 27129973 is about 300.4806111135.

The spelling of 27129973 in words is "twenty-seven million, one hundred twenty-nine thousand, nine hundred seventy-three".