27642421 has 16 divisors (see below), whose sum is σ = 29652480. Its totient is φ = 25724160.

The previous prime is 27642409. The next prime is 27642431. The reversal of 27642421 is 12424672.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 27642421 - 2¹¹ = 27640373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27642421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27642401) 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, 118521 + ... + 118753.

It is an arithmetic number, because the mean of its divisors is an integer number (1853280).

Almost surely, 2^27642421 is an apocalyptic number.

It is an amenable number.

27642421 is a deficient number, since it is larger than the sum of its proper divisors (2010059).

27642421 is a wasteful number, since it uses less digits than its factorization.

27642421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396.

The product of its digits is 5376, while the sum is 28.

The square root of 27642421 is about 5257.6060141475. The cubic root of 27642421 is about 302.3607117769.

The spelling of 27642421 in words is "twenty-seven million, six hundred forty-two thousand, four hundred twenty-one".