18672919 has 8 divisors (see below), whose sum is σ = 19811088. Its totient is φ = 17539200.

The previous prime is 18672859. The next prime is 18672923. The reversal of 18672919 is 91927681.

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 18672919 - 2²³ = 10284311 is a prime.

It is a super-2 number, since 2×18672919² = 697355807961122, 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 (18672949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12144 + ... + 13594.

It is an arithmetic number, because the mean of its divisors is an integer number (2476386).

Almost surely, 2^18672919 is an apocalyptic number.

18672919 is a deficient number, since it is larger than the sum of its proper divisors (1138169).

18672919 is a wasteful number, since it uses less digits than its factorization.

18672919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225.

The product of its digits is 54432, while the sum is 43.

The square root of 18672919 is about 4321.2173053435. The cubic root of 18672919 is about 265.3000943537.

It can be divided in two parts, 18672 and 919, that added together give a palindrome (19591).

The spelling of 18672919 in words is "eighteen million, six hundred seventy-two thousand, nine hundred nineteen".