161998384 has 40 divisors (see below), whose sum is σ = 329978880. Its totient is φ = 76895808.

The previous prime is 161998381. The next prime is 161998393. The reversal of 161998384 is 483899161.

161998384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161998384² = 52486952837222912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161998381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49569 + ... + 52735.

It is an arithmetic number, because the mean of its divisors is an integer number (8249472).

Almost surely, 2^161998384 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 161998384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164989440).

161998384 is an abundant number, since it is smaller than the sum of its proper divisors (167980496).

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

161998384 is a wasteful number, since it uses less digits than its factorization.

161998384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3337 (or 3331 counting only the distinct ones).

The product of its digits is 373248, while the sum is 49.

The square root of 161998384 is about 12727.8585787241. The cubic root of 161998384 is about 545.1343652097.

The spelling of 161998384 in words is "one hundred sixty-one million, nine hundred ninety-eight thousand, three hundred eighty-four".