84858921 has 40 divisors (see below), whose sum is σ = 152518080. Its totient is φ = 45932832.

The previous prime is 84858899. The next prime is 84858929. The reversal of 84858921 is 12985848.

It is a happy number.

84858921 is a `hidden beast` number, since 8 + 48 + 589 + 21 = 666.

It is not a de Polignac number, because 84858921 - 2⁷ = 84858793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84858929) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6835 + ... + 14711.

It is an arithmetic number, because the mean of its divisors is an integer number (3812952).

Almost surely, 2^84858921 is an apocalyptic number.

84858921 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

84858921 is a deficient number, since it is larger than the sum of its proper divisors (67659159).

84858921 is a wasteful number, since it uses less digits than its factorization.

84858921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7915 (or 7906 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 84858921 is about 9211.8901969140. The cubic root of 84858921 is about 439.4395774778.

The spelling of 84858921 in words is "eighty-four million, eight hundred fifty-eight thousand, nine hundred twenty-one".