84387791 has 4 divisors (see below), whose sum is σ = 84407400. Its totient is φ = 84368184.

The previous prime is 84387763. The next prime is 84387841. The reversal of 84387791 is 19778348.

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 84387791 - 2⁶ = 84387727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84387731) 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, 236 + ... + 12993.

It is an arithmetic number, because the mean of its divisors is an integer number (21101850).

Almost surely, 2^84387791 is an apocalyptic number.

84387791 is a deficient number, since it is larger than the sum of its proper divisors (19609).

84387791 is a wasteful number, since it uses less digits than its factorization.

84387791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19608.

The product of its digits is 338688, while the sum is 47.

The square root of 84387791 is about 9186.2827629025. The cubic root of 84387791 is about 438.6248232333.

The spelling of 84387791 in words is "eighty-four million, three hundred eighty-seven thousand, seven hundred ninety-one".