18398384146 has 4 divisors (see below), whose sum is σ = 27597576222. Its totient is φ = 9199192072.

The previous prime is 18398384101. The next prime is 18398384197. The reversal of 18398384146 is 64148389381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64148389381 = 269 ⋅238469849.

It can be written as a sum of positive squares in only one way, i.e., 16638162121 + 1760222025 = 128989^2 + 41955^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4599596035 + ... + 4599596038.

Almost surely, 2^18398384146 is an apocalyptic number.

18398384146 is a deficient number, since it is larger than the sum of its proper divisors (9199192076).

18398384146 is an equidigital number, since it uses as much as digits as its factorization.

18398384146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9199192075.

The product of its digits is 3981312, while the sum is 55.

The spelling of 18398384146 in words is "eighteen billion, three hundred ninety-eight million, three hundred eighty-four thousand, one hundred forty-six".