18940806 has 24 divisors (see below), whose sum is σ = 41290704. Its totient is φ = 6274800.

The previous prime is 18940793. The next prime is 18940841. The reversal of 18940806 is 60804981.

It is a happy number.

18940806 is nontrivially palindromic in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145 + ... + 6156.

It is an arithmetic number, because the mean of its divisors is an integer number (1720446).

Almost surely, 2^18940806 is an apocalyptic number.

18940806 is an abundant number, since it is smaller than the sum of its proper divisors (22349898).

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

18940806 is a wasteful number, since it uses less digits than its factorization.

18940806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6476 (or 6473 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18940806 is about 4352.1036292809. The cubic root of 18940806 is about 266.5627654250.

The spelling of 18940806 in words is "eighteen million, nine hundred forty thousand, eight hundred six".