18858906 has 80 divisors (see below), whose sum is σ = 48612960. Its totient is φ = 5404320.

The previous prime is 18858901. The next prime is 18858907. The reversal of 18858906 is 60985881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18858901) 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, 33580 + ... + 34136.

It is an arithmetic number, because the mean of its divisors is an integer number (607662).

Almost surely, 2^18858906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18858906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24306480).

18858906 is an abundant number, since it is smaller than the sum of its proper divisors (29754054).

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

18858906 is a wasteful number, since it uses less digits than its factorization.

18858906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 18858906 is about 4342.6841929848. The cubic root of 18858906 is about 266.1780047354.

The spelling of 18858906 in words is "eighteen million, eight hundred fifty-eight thousand, nine hundred six".