84791989 has 4 divisors (see below), whose sum is σ = 85114656. Its totient is φ = 84469324.

The previous prime is 84791981. The next prime is 84792017. The reversal of 84791989 is 98919748.

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 84791989 - 2³ = 84791981 is a prime.

It is a super-2 number, since 2×84791989² = 14379362797152242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84791981) 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, 160939 + ... + 161464.

It is an arithmetic number, because the mean of its divisors is an integer number (21278664).

Almost surely, 2^84791989 is an apocalyptic number.

It is an amenable number.

84791989 is a deficient number, since it is larger than the sum of its proper divisors (322667).

84791989 is a wasteful number, since it uses less digits than its factorization.

84791989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322666.

The product of its digits is 1306368, while the sum is 55.

The square root of 84791989 is about 9208.2565667992. The cubic root of 84791989 is about 439.3240119178.

The spelling of 84791989 in words is "eighty-four million, seven hundred ninety-one thousand, nine hundred eighty-nine".