18400982 has 8 divisors (see below), whose sum is σ = 27742176. Its totient is φ = 9153592.

The previous prime is 18400981. The next prime is 18401023. The reversal of 18400982 is 28900481.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18400982² = 677192277128648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18400981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22958 + ... + 23745.

It is an arithmetic number, because the mean of its divisors is an integer number (3467772).

Almost surely, 2^18400982 is an apocalyptic number.

18400982 is a deficient number, since it is larger than the sum of its proper divisors (9341194).

18400982 is a wasteful number, since it uses less digits than its factorization.

18400982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46902.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 18400982 is about 4289.6365813435. The cubic root of 18400982 is about 264.0059208192.

The spelling of 18400982 in words is "eighteen million, four hundred thousand, nine hundred eighty-two".