1838191820 has 48 divisors (see below), whose sum is σ = 3971499168. Its totient is φ = 714147840.

The previous prime is 1838191769. The next prime is 1838191837. The reversal of 1838191820 is 281918381.

It is a super-2 number, since 2×1838191820² = 6757898334229824800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 496175 + ... + 499865.

It is an arithmetic number, because the mean of its divisors is an integer number (82739566).

Almost surely, 2^1838191820 is an apocalyptic number.

1838191820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1838191820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1985749584).

1838191820 is an abundant number, since it is smaller than the sum of its proper divisors (2133307348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1838191820 is a wasteful number, since it uses less digits than its factorization.

1838191820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410 (or 4408 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 1838191820 is about 42874.1392916523. The cubic root of 1838191820 is about 1224.9836055004.

The spelling of 1838191820 in words is "one billion, eight hundred thirty-eight million, one hundred ninety-one thousand, eight hundred twenty".