84063989 has 4 divisors (see below), whose sum is σ = 85650156. Its totient is φ = 82477824.

The previous prime is 84063943. The next prime is 84064007. The reversal of 84063989 is 98936048.

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

It can be written as a sum of positive squares in 2 ways, for example, as 55011889 + 29052100 = 7417^2 + 5390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84063989 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 (84063389) 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, 793004 + ... + 793109.

It is an arithmetic number, because the mean of its divisors is an integer number (21412539).

Almost surely, 2^84063989 is an apocalyptic number.

It is an amenable number.

84063989 is a deficient number, since it is larger than the sum of its proper divisors (1586167).

84063989 is a wasteful number, since it uses less digits than its factorization.

84063989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586166.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 84063989 is about 9168.6416114929. The cubic root of 84063989 is about 438.0630925286.

The spelling of 84063989 in words is "eighty-four million, sixty-three thousand, nine hundred eighty-nine".