27409921 has 16 divisors (see below), whose sum is σ = 35278848. Its totient is φ = 20667600.

The previous prime is 27409909. The next prime is 27409927. The reversal of 27409921 is 12990472.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 27409921 - 2⁷ = 27409793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27409927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3355 + ... + 8128.

It is an arithmetic number, because the mean of its divisors is an integer number (2204928).

Almost surely, 2^27409921 is an apocalyptic number.

It is an amenable number.

27409921 is a deficient number, since it is larger than the sum of its proper divisors (7868927).

27409921 is a wasteful number, since it uses less digits than its factorization.

27409921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11532.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 27409921 is about 5235.4485003675. The cubic root of 27409921 is about 301.5106067167.

The spelling of 27409921 in words is "twenty-seven million, four hundred nine thousand, nine hundred twenty-one".