27405243 has 8 divisors (see below), whose sum is σ = 40600400. Its totient is φ = 18270144.

The previous prime is 27405229. The next prime is 27405251. The reversal of 27405243 is 34250472.

It is not a de Polignac number, because 27405243 - 2¹⁴ = 27388859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1015009 = 27405243 / (2 + 7 + 4 + 0 + 5 + 2 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27405143) 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, 507478 + ... + 507531.

It is an arithmetic number, because the mean of its divisors is an integer number (5075050).

Almost surely, 2^27405243 is an apocalyptic number.

27405243 is a deficient number, since it is larger than the sum of its proper divisors (13195157).

27405243 is a wasteful number, since it uses less digits than its factorization.

27405243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015018 (or 1015012 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 27405243 is about 5235.0017191974. The cubic root of 27405243 is about 301.4934529902.

The spelling of 27405243 in words is "twenty-seven million, four hundred five thousand, two hundred forty-three".