18906919 has 8 divisors (see below), whose sum is σ = 20048000. Its totient is φ = 17780472.

The previous prime is 18906917. The next prime is 18906961. The reversal of 18906919 is 91960981.

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 18906919 - 2¹ = 18906917 is a prime.

It is a super-2 number, since 2×18906919² = 714943172145122, 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 (18906913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 939 + ... + 6220.

It is an arithmetic number, because the mean of its divisors is an integer number (2506000).

Almost surely, 2^18906919 is an apocalyptic number.

18906919 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18906919 is a deficient number, since it is larger than the sum of its proper divisors (1141081).

18906919 is a wasteful number, since it uses less digits than its factorization.

18906919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7317.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 18906919 is about 4348.2087116421. The cubic root of 18906919 is about 266.4037013602.

The spelling of 18906919 in words is "eighteen million, nine hundred six thousand, nine hundred nineteen".