27381957 has 4 divisors (see below), whose sum is σ = 36509280. Its totient is φ = 18254636.

The previous prime is 27381943. The next prime is 27381967. The reversal of 27381957 is 75918372.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27381957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27381967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4563657 + ... + 4563662.

It is an arithmetic number, because the mean of its divisors is an integer number (9127320).

Almost surely, 2^27381957 is an apocalyptic number.

It is an amenable number.

27381957 is a deficient number, since it is larger than the sum of its proper divisors (9127323).

27381957 is an equidigital number, since it uses as much as digits as its factorization.

27381957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9127322.

The product of its digits is 105840, while the sum is 42.

The square root of 27381957 is about 5232.7771785162. Note that the first 3 decimals coincide. The cubic root of 27381957 is about 301.4080366591.

The spelling of 27381957 in words is "twenty-seven million, three hundred eighty-one thousand, nine hundred fifty-seven".