1838434920 has 192 divisors, whose sum is σ = 6505168320. Its totient is φ = 414360576.

The previous prime is 1838434901. The next prime is 1838434931. The reversal of 1838434920 is 294348381.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 427099 + ... + 431381.

It is an arithmetic number, because the mean of its divisors is an integer number (33881085).

Almost surely, 2^1838434920 is an apocalyptic number.

1838434920 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 1838434920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3252584160).

1838434920 is an abundant number, since it is smaller than the sum of its proper divisors (4666733400).

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

1838434920 is a wasteful number, since it uses less digits than its factorization.

1838434920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384 (or 4373 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 1838434920 is about 42876.9742402609. The cubic root of 1838434920 is about 1225.0376042878.

The spelling of 1838434920 in words is "one billion, eight hundred thirty-eight million, four hundred thirty-four thousand, nine hundred twenty".