18734981 has 2 divisors, whose sum is σ = 18734982. Its totient is φ = 18734980.

The previous prime is 18734977. The next prime is 18735001. The reversal of 18734981 is 18943781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11498881 + 7236100 = 3391^2 + 2690^2 .

It is a cyclic number.

It is not a de Polignac number, because 18734981 - 2² = 18734977 is a prime.

It is a super-2 number, since 2×18734981² = 701999026140722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18734941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9367490 + 9367491.

It is an arithmetic number, because the mean of its divisors is an integer number (9367491).

Almost surely, 2^18734981 is an apocalyptic number.

It is an amenable number.

18734981 is a deficient number, since it is larger than the sum of its proper divisors (1).

18734981 is an equidigital number, since it uses as much as digits as its factorization.

18734981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 18734981 is about 4328.3924267562. The cubic root of 18734981 is about 265.5936897074.

The spelling of 18734981 in words is "eighteen million, seven hundred thirty-four thousand, nine hundred eighty-one".