19139218 has 8 divisors (see below), whose sum is σ = 32810112. Its totient is φ = 8202516.

The previous prime is 19139209. The next prime is 19139221. The reversal of 19139218 is 81293191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 683530 + ... + 683557.

It is an arithmetic number, because the mean of its divisors is an integer number (4101264).

Almost surely, 2^19139218 is an apocalyptic number.

19139218 is a deficient number, since it is larger than the sum of its proper divisors (13670894).

19139218 is a wasteful number, since it uses less digits than its factorization.

19139218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367096.

The product of its digits is 3888, while the sum is 34.

The square root of 19139218 is about 4374.8391970448. The cubic root of 19139218 is about 267.4903155431.

The spelling of 19139218 in words is "nineteen million, one hundred thirty-nine thousand, two hundred eighteen".