27021945 has 16 divisors (see below), whose sum is σ = 44156160. Its totient is φ = 14104704.

The previous prime is 27021923. The next prime is 27021983. The reversal of 27021945 is 54912072.

It is not a de Polignac number, because 27021945 - 2¹⁸ = 26759801 is a prime.

It is an unprimeable number.

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, 18460 + ... + 19869.

It is an arithmetic number, because the mean of its divisors is an integer number (2759760).

Almost surely, 2^27021945 is an apocalyptic number.

It is an amenable number.

27021945 is a deficient number, since it is larger than the sum of its proper divisors (17134215).

27021945 is a wasteful number, since it uses less digits than its factorization.

27021945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38384.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 27021945 is about 5198.2636524132. The cubic root of 27021945 is about 300.0812557675.

It can be divided in two parts, 27021 and 945, that added together give a triangular number (27966 = T₂₃₆).

The spelling of 27021945 in words is "twenty-seven million, twenty-one thousand, nine hundred forty-five".