27990143 has 4 divisors (see below), whose sum is σ = 29636640. Its totient is φ = 26343648.

The previous prime is 27990139. The next prime is 27990161. The reversal of 27990143 is 34109972.

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 27990143 - 2² = 27990139 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 (27990113) 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, 823223 + ... + 823256.

It is an arithmetic number, because the mean of its divisors is an integer number (7409160).

Almost surely, 2^27990143 is an apocalyptic number.

27990143 is a deficient number, since it is larger than the sum of its proper divisors (1646497).

27990143 is a wasteful number, since it uses less digits than its factorization.

27990143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646496.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 27990143 is about 5290.5711411907. The cubic root of 27990143 is about 303.6232600798.

The spelling of 27990143 in words is "twenty-seven million, nine hundred ninety thousand, one hundred forty-three".