18470981 has 8 divisors (see below), whose sum is σ = 18768000. Its totient is φ = 18176400.

The previous prime is 18470957. The next prime is 18470987. The reversal of 18470981 is 18907481.

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

It is a cyclic number.

It is not a de Polignac number, because 18470981 - 2¹⁸ = 18208837 is a prime.

It is a super-2 number, since 2×18470981² = 682354278204722, 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 (18470987) 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, 19640 + ... + 20558.

It is an arithmetic number, because the mean of its divisors is an integer number (2346000).

Almost surely, 2^18470981 is an apocalyptic number.

It is an amenable number.

18470981 is a deficient number, since it is larger than the sum of its proper divisors (297019).

18470981 is a wasteful number, since it uses less digits than its factorization.

18470981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18470981 is about 4297.7879193836. The cubic root of 18470981 is about 264.3402646866.

The spelling of 18470981 in words is "eighteen million, four hundred seventy thousand, nine hundred eighty-one".