18629946 has 48 divisors (see below), whose sum is σ = 42897600. Its totient is φ = 5992920.

The previous prime is 18629939. The next prime is 18629957. The reversal of 18629946 is 64992681.

It is a happy number.

18629946 is a `hidden beast` number, since 18 + 629 + 9 + 4 + 6 = 666.

Its product of digits (186624) is a multiple of the sum of its prime factors (432).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51715 + ... + 52073.

It is an arithmetic number, because the mean of its divisors is an integer number (893700).

Almost surely, 2^18629946 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18629946, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21448800).

18629946 is an abundant number, since it is smaller than the sum of its proper divisors (24267654).

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

18629946 is a wasteful number, since it uses less digits than its factorization.

18629946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 395 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 18629946 is about 4316.2421155445. The cubic root of 18629946 is about 265.0964215398.

The spelling of 18629946 in words is "eighteen million, six hundred twenty-nine thousand, nine hundred forty-six".