18534919 has 8 divisors (see below), whose sum is σ = 20235152. Its totient is φ = 16873920.

The previous prime is 18534889. The next prime is 18534959. The reversal of 18534919 is 91943581.

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 18534919 - 2⁹ = 18534407 is a prime.

It is a super-2 number, since 2×18534919² = 687086444673122, 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 (18534959) 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, 8817 + ... + 10714.

It is an arithmetic number, because the mean of its divisors is an integer number (2529394).

Almost surely, 2^18534919 is an apocalyptic number.

18534919 is a deficient number, since it is larger than the sum of its proper divisors (1700233).

18534919 is a wasteful number, since it uses less digits than its factorization.

18534919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19617.

The product of its digits is 38880, while the sum is 40.

The square root of 18534919 is about 4305.2199711513. The cubic root of 18534919 is about 264.6449213742.

The spelling of 18534919 in words is "eighteen million, five hundred thirty-four thousand, nine hundred nineteen".