27378921 has 8 divisors (see below), whose sum is σ = 37682944. Its totient is φ = 17663760.

The previous prime is 27378889. The next prime is 27378931. The reversal of 27378921 is 12987372.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27378921 - 2⁵ = 27378889 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 27378921.

It is not an unprimeable number, because it can be changed into a prime (27378931) 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, 147106 + ... + 147291.

It is an arithmetic number, because the mean of its divisors is an integer number (4710368).

Almost surely, 2^27378921 is an apocalyptic number.

It is an amenable number.

27378921 is a deficient number, since it is larger than the sum of its proper divisors (10304023).

27378921 is a wasteful number, since it uses less digits than its factorization.

27378921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294431.

The product of its digits is 42336, while the sum is 39.

The square root of 27378921 is about 5232.4870759515. The cubic root of 27378921 is about 301.3968966151.

The spelling of 27378921 in words is "twenty-seven million, three hundred seventy-eight thousand, nine hundred twenty-one".