27861398 has 4 divisors (see below), whose sum is σ = 41792100. Its totient is φ = 13930698.

The previous prime is 27861389. The next prime is 27861401. The reversal of 27861398 is 89316872.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6965348 + ... + 6965351.

It is an arithmetic number, because the mean of its divisors is an integer number (10448025).

Almost surely, 2^27861398 is an apocalyptic number.

27861398 is a deficient number, since it is larger than the sum of its proper divisors (13930702).

27861398 is a wasteful number, since it uses less digits than its factorization.

27861398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13930701.

The product of its digits is 145152, while the sum is 44.

The square root of 27861398 is about 5278.3897165708. The cubic root of 27861398 is about 303.1570237609.

The spelling of 27861398 in words is "twenty-seven million, eight hundred sixty-one thousand, three hundred ninety-eight".