27819121 has 16 divisors (see below), whose sum is σ = 32698368. Its totient is φ = 23403600.

The previous prime is 27819119. The next prime is 27819133. The reversal of 27819121 is 12191872.

It is not a de Polignac number, because 27819121 - 2¹ = 27819119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27819101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6070 + ... + 9616.

It is an arithmetic number, because the mean of its divisors is an integer number (2043648).

Almost surely, 2^27819121 is an apocalyptic number.

It is an amenable number.

27819121 is a deficient number, since it is larger than the sum of its proper divisors (4879247).

27819121 is a wasteful number, since it uses less digits than its factorization.

27819121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3612.

The product of its digits is 2016, while the sum is 31.

The square root of 27819121 is about 5274.3834710798. The cubic root of 27819121 is about 303.0036088988.

The spelling of 27819121 in words is "twenty-seven million, eight hundred nineteen thousand, one hundred twenty-one".