18389398514 has 4 divisors (see below), whose sum is σ = 27584097774. Its totient is φ = 9194699256.

The previous prime is 18389398513. The next prime is 18389398519. The reversal of 18389398514 is 41589398381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41589398381 = 14423 ⋅2883547.

It can be written as a sum of positive squares in only one way, i.e., 17938048489 + 451350025 = 133933^2 + 21245^2 .

It is not an unprimeable number, because it can be changed into a prime (18389398513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4597349627 + ... + 4597349630.

Almost surely, 2^18389398514 is an apocalyptic number.

18389398514 is a deficient number, since it is larger than the sum of its proper divisors (9194699260).

18389398514 is an equidigital number, since it uses as much as digits as its factorization.

18389398514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9194699259.

The product of its digits is 7464960, while the sum is 59.

The spelling of 18389398514 in words is "eighteen billion, three hundred eighty-nine million, three hundred ninety-eight thousand, five hundred fourteen".