18390004381 has 8 divisors (see below), whose sum is σ = 21072605120. Its totient is φ = 15721267968.

The previous prime is 18390004379. The next prime is 18390004387. The reversal of 18390004381 is 18340009381.

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

It is not a de Polignac number, because 18390004381 - 2¹ = 18390004379 is a prime.

It is a super-2 number, since 2×18390004381² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18390004381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390004387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3463236 + ... + 3468541.

It is an arithmetic number, because the mean of its divisors is an integer number (2634075640).

Almost surely, 2^18390004381 is an apocalyptic number.

It is an amenable number.

18390004381 is a deficient number, since it is larger than the sum of its proper divisors (2682600739).

18390004381 is an equidigital number, since it uses as much as digits as its factorization.

18390004381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6932163.

The product of its (nonzero) digits is 20736, while the sum is 37.

Subtracting from 18390004381 its reverse (18340009381), we obtain a triangular number (49995000 = T₉₉₉₉).

The spelling of 18390004381 in words is "eighteen billion, three hundred ninety million, four thousand, three hundred eighty-one".