18462981 has 8 divisors (see below), whose sum is σ = 24637984. Its totient is φ = 12298320.

The previous prime is 18462979. The next prime is 18463001. The reversal of 18462981 is 18926481.

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

It is not a de Polignac number, because 18462981 - 2¹ = 18462979 is a prime.

It is a super-2 number, since 2×18462981² = 681763334812722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18462971) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3930 + ... + 7236.

It is an arithmetic number, because the mean of its divisors is an integer number (3079748).

Almost surely, 2^18462981 is an apocalyptic number.

It is an amenable number.

18462981 is a deficient number, since it is larger than the sum of its proper divisors (6175003).

18462981 is a wasteful number, since it uses less digits than its factorization.

18462981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5171.

The product of its digits is 27648, while the sum is 39.

The square root of 18462981 is about 4296.8571072355. The cubic root of 18462981 is about 264.3020962123.

The spelling of 18462981 in words is "eighteen million, four hundred sixty-two thousand, nine hundred eighty-one".