381998916 has 96 divisors (see below), whose sum is σ = 1080038400. Its totient is φ = 117503136.

The previous prime is 381998879. The next prime is 381998921. The reversal of 381998916 is 619899183.

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

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, 112045 + ... + 115403.

It is an arithmetic number, because the mean of its divisors is an integer number (11250400).

Almost surely, 2^381998916 is an apocalyptic number.

381998916 is a gapful number since it is divisible by the number (36) 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 381998916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (540019200).

381998916 is an abundant number, since it is smaller than the sum of its proper divisors (698039484).

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

381998916 is a wasteful number, since it uses less digits than its factorization.

381998916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397 (or 3377 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 381998916 is about 19544.7925545399. The cubic root of 381998916 is about 725.5834643613.

The spelling of 381998916 in words is "three hundred eighty-one million, nine hundred ninety-eight thousand, nine hundred sixteen".