18630906 has 64 divisors (see below), whose sum is σ = 46110720. Its totient is φ = 4898880.

The previous prime is 18630901. The next prime is 18630917. The reversal of 18630906 is 60903681.

It is a super-2 number, since 2×18630906² = 694221316761672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18630901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29211 + ... + 29841.

It is an arithmetic number, because the mean of its divisors is an integer number (720480).

Almost surely, 2^18630906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18630906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23055360).

18630906 is an abundant number, since it is smaller than the sum of its proper divisors (27479814).

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

18630906 is a wasteful number, since it uses less digits than its factorization.

18630906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 18630906 is about 4316.3533219606. The cubic root of 18630906 is about 265.1009749292.

The spelling of 18630906 in words is "eighteen million, six hundred thirty thousand, nine hundred six".