18909982 has 24 divisors (see below), whose sum is σ = 35536536. Its totient is φ = 7480368.

The previous prime is 18909949. The next prime is 18909983. The reversal of 18909982 is 28990981.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18909983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6148 + ... + 8695.

It is an arithmetic number, because the mean of its divisors is an integer number (1480689).

Almost surely, 2^18909982 is an apocalyptic number.

18909982 is a deficient number, since it is larger than the sum of its proper divisors (16626554).

18909982 is a wasteful number, since it uses less digits than its factorization.

18909982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14872 (or 14865 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 18909982 is about 4348.5609113821. The cubic root of 18909982 is about 266.4180867549.

It can be divided in two parts, 18909 and 982, that added together give a palindrome (19891).

The spelling of 18909982 in words is "eighteen million, nine hundred nine thousand, nine hundred eighty-two".