27405989 has 16 divisors (see below), whose sum is σ = 31434480. Its totient is φ = 23669760.

The previous prime is 27405977. The next prime is 27405991. The reversal of 27405989 is 98950472.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4202500 + 23203489 = 2050^2 + 4817^2 .

It is a cyclic number.

It is not a de Polignac number, because 27405989 - 2²⁰ = 26357413 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 (27402989) 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, 59219 + ... + 59679.

It is an arithmetic number, because the mean of its divisors is an integer number (1964655).

Almost surely, 2^27405989 is an apocalyptic number.

It is an amenable number.

27405989 is a deficient number, since it is larger than the sum of its proper divisors (4028491).

27405989 is a wasteful number, since it uses less digits than its factorization.

27405989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 27405989 is about 5235.0729698830. The cubic root of 27405989 is about 301.4961886234.

The spelling of 27405989 in words is "twenty-seven million, four hundred five thousand, nine hundred eighty-nine".