1818486381 has 16 divisors (see below), whose sum is σ = 2504268288. Its totient is φ = 1172558400.

The previous prime is 1818486347. The next prime is 1818486389. The reversal of 1818486381 is 1836848181.

It is a happy number.

It is not a de Polignac number, because 1818486381 - 2⁶ = 1818486317 is a prime.

It is a super-2 number, since 2×1818486381² = 6613785435764954322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1818486381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818486389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203671 + ... + 212411.

It is an arithmetic number, because the mean of its divisors is an integer number (156516768).

Almost surely, 2^1818486381 is an apocalyptic number.

It is an amenable number.

1818486381 is a deficient number, since it is larger than the sum of its proper divisors (685781907).

1818486381 is a wasteful number, since it uses less digits than its factorization.

1818486381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11012.

The product of its digits is 294912, while the sum is 48.

The square root of 1818486381 is about 42643.7144371829. The cubic root of 1818486381 is about 1220.5905903872.

The spelling of 1818486381 in words is "one billion, eight hundred eighteen million, four hundred eighty-six thousand, three hundred eighty-one".