27921799 has 2 divisors, whose sum is σ = 27921800. Its totient is φ = 27921798.

The previous prime is 27921763. The next prime is 27921823. The reversal of 27921799 is 99712972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27921799 - 2⁷ = 27921671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27921709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13960899 + 13960900.

It is an arithmetic number, because the mean of its divisors is an integer number (13960900).

Almost surely, 2^27921799 is an apocalyptic number.

27921799 is a deficient number, since it is larger than the sum of its proper divisors (1).

27921799 is an equidigital number, since it uses as much as digits as its factorization.

27921799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 46.

The square root of 27921799 is about 5284.1081555926. The cubic root of 27921799 is about 303.3759380106.

The spelling of 27921799 in words is "twenty-seven million, nine hundred twenty-one thousand, seven hundred ninety-nine".