1838397816 has 128 divisors (see below), whose sum is σ = 5458752000. Its totient is φ = 571239936.

The previous prime is 1838397773. The next prime is 1838397851. The reversal of 1838397816 is 6187938381.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 390565 + ... + 395243.

It is an arithmetic number, because the mean of its divisors is an integer number (42646500).

Almost surely, 2^1838397816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1838397816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2729376000).

1838397816 is an abundant number, since it is smaller than the sum of its proper divisors (3620354184).

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

1838397816 is a wasteful number, since it uses less digits than its factorization.

1838397816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4818 (or 4808 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 1838397816 is about 42876.5415582927. The cubic root of 1838397816 is about 1225.0293628391.

The spelling of 1838397816 in words is "one billion, eight hundred thirty-eight million, three hundred ninety-seven thousand, eight hundred sixteen".