27842405 has 4 divisors (see below), whose sum is σ = 33410892. Its totient is φ = 22273920.

The previous prime is 27842401. The next prime is 27842411. The reversal of 27842405 is 50424872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21696964 + 6145441 = 4658^2 + 2479^2 .

It is not a de Polignac number, because 27842405 - 2² = 27842401 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 (27842401) 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, 2784236 + ... + 2784245.

It is an arithmetic number, because the mean of its divisors is an integer number (8352723).

Almost surely, 2^27842405 is an apocalyptic number.

It is an amenable number.

27842405 is a deficient number, since it is larger than the sum of its proper divisors (5568487).

27842405 is an equidigital number, since it uses as much as digits as its factorization.

27842405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5568486.

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 27842405 is about 5276.5902816118. The cubic root of 27842405 is about 303.0881211378.

The spelling of 27842405 in words is "twenty-seven million, eight hundred forty-two thousand, four hundred five".