427087891 has 4 divisors (see below), whose sum is σ = 427510512. Its totient is φ = 426665272.

The previous prime is 427087861. The next prime is 427087931. The reversal of 427087891 is 198780724.

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

It is a cyclic number.

It is not a de Polignac number, because 427087891 - 2⁷ = 427087763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427087861) 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, 209791 + ... + 211816.

It is an arithmetic number, because the mean of its divisors is an integer number (106877628).

Almost surely, 2^427087891 is an apocalyptic number.

427087891 is a deficient number, since it is larger than the sum of its proper divisors (422621).

427087891 is a wasteful number, since it uses less digits than its factorization.

427087891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422620.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 427087891 is about 20666.1048821494. The cubic root of 427087891 is about 753.0764836684.

The spelling of 427087891 in words is "four hundred twenty-seven million, eighty-seven thousand, eight hundred ninety-one".