27992381 has 8 divisors (see below), whose sum is σ = 28756728. Its totient is φ = 27232000.

The previous prime is 27992359. The next prime is 27992383. The reversal of 27992381 is 18329972.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8281 + 27984100 = 91^2 + 5290^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 27992381 - 2⁶ = 27992317 is a prime.

It is a super-2 number, since 2×27992381² = 1567146788098322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27992383) 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 7 ways as a sum of consecutive naturals, for example, 18161 + ... + 19641.

It is an arithmetic number, because the mean of its divisors is an integer number (3594591).

Almost surely, 2^27992381 is an apocalyptic number.

It is an amenable number.

27992381 is a deficient number, since it is larger than the sum of its proper divisors (764347).

27992381 is a wasteful number, since it uses less digits than its factorization.

27992381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983.

The product of its digits is 54432, while the sum is 41.

The square root of 27992381 is about 5290.7826453182. The cubic root of 27992381 is about 303.6313521040.

The spelling of 27992381 in words is "twenty-seven million, nine hundred ninety-two thousand, three hundred eighty-one".