18139419 has 6 divisors (see below), whose sum is σ = 26201396. Its totient is φ = 12092940.

The previous prime is 18139417. The next prime is 18139463. The reversal of 18139419 is 91493181.

It is not a de Polignac number, because 18139419 - 2¹ = 18139417 is a prime.

It is a super-2 number, since 2×18139419² = 658077043315122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18139411) 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 5 ways as a sum of consecutive naturals, for example, 1007737 + ... + 1007754.

Almost surely, 2^18139419 is an apocalyptic number.

18139419 is a deficient number, since it is larger than the sum of its proper divisors (8061977).

18139419 is a wasteful number, since it uses less digits than its factorization.

18139419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015497 (or 2015494 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 18139419 is about 4259.0396804914. The cubic root of 18139419 is about 262.7490316981.

The spelling of 18139419 in words is "eighteen million, one hundred thirty-nine thousand, four hundred nineteen".