84021858 has 12 divisors (see below), whose sum is σ = 182047398. Its totient is φ = 28007280.

The previous prime is 84021823. The next prime is 84021859. The reversal of 84021858 is 85812048.

It can be written as a sum of positive squares in only one way, i.e., 74080449 + 9941409 = 8607^2 + 3153^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84021859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2333923 + ... + 2333958.

Almost surely, 2^84021858 is an apocalyptic number.

84021858 is an abundant number, since it is smaller than the sum of its proper divisors (98025540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84021858 is a wasteful number, since it uses less digits than its factorization.

84021858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4667889 (or 4667886 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 84021858 is about 9166.3437640097. The cubic root of 84021858 is about 437.9898978092.

The spelling of 84021858 in words is "eighty-four million, twenty-one thousand, eight hundred fifty-eight".