18262021838 has 4 divisors (see below), whose sum is σ = 27393032760. Its totient is φ = 9131010918.

The previous prime is 18262021837. The next prime is 18262021901. The reversal of 18262021838 is 83812026281.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×18262021838² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18262021795 and 18262021804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18262021831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4565505458 + ... + 4565505461.

It is an arithmetic number, because the mean of its divisors is an integer number (6848258190).

Almost surely, 2^18262021838 is an apocalyptic number.

18262021838 is a deficient number, since it is larger than the sum of its proper divisors (9131010922).

18262021838 is an equidigital number, since it uses as much as digits as its factorization.

18262021838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9131010921.

The product of its (nonzero) digits is 73728, while the sum is 41.

The spelling of 18262021838 in words is "eighteen billion, two hundred sixty-two million, twenty-one thousand, eight hundred thirty-eight".