18992481 has 4 divisors (see below), whose sum is σ = 25323312. Its totient is φ = 12661652.

The previous prime is 18992473. The next prime is 18992531. The reversal of 18992481 is 18429981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18992481 - 2³ = 18992473 is a prime.

It is a super-2 number, since 2×18992481² = 721428669070722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18992401) 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 3 ways as a sum of consecutive naturals, for example, 3165411 + ... + 3165416.

It is an arithmetic number, because the mean of its divisors is an integer number (6330828).

Almost surely, 2^18992481 is an apocalyptic number.

It is an amenable number.

18992481 is a deficient number, since it is larger than the sum of its proper divisors (6330831).

18992481 is an equidigital number, since it uses as much as digits as its factorization.

18992481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6330830.

The product of its digits is 41472, while the sum is 42.

The square root of 18992481 is about 4358.0363697427. The cubic root of 18992481 is about 266.8049607332.

Subtracting from 18992481 its reverse (18429981), we obtain a square (562500 = 750²).

The spelling of 18992481 in words is "eighteen million, nine hundred ninety-two thousand, four hundred eighty-one".