27978941 has 4 divisors (see below), whose sum is σ = 28164384. Its totient is φ = 27793500.

The previous prime is 27978871. The next prime is 27978943. The reversal of 27978941 is 14987972.

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 not a de Polignac number, because 27978941 - 2¹⁸ = 27716797 is a prime.

It is a super-2 number, since 2×27978941² = 1565642278962962, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 27978941 parts by 7480 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27978943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92495 + ... + 92796.

It is an arithmetic number, because the mean of its divisors is an integer number (7041096).

Almost surely, 2^27978941 is an apocalyptic number.

It is an amenable number.

27978941 is a deficient number, since it is larger than the sum of its proper divisors (185443).

27978941 is a wasteful number, since it uses less digits than its factorization.

27978941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185442.

The product of its digits is 254016, while the sum is 47.

The square root of 27978941 is about 5289.5123593768. The cubic root of 27978941 is about 303.5827500856.

The spelling of 27978941 in words is "twenty-seven million, nine hundred seventy-eight thousand, nine hundred forty-one".