161900384 has 48 divisors (see below), whose sum is σ = 338839200. Its totient is φ = 75884544.

The previous prime is 161900371. The next prime is 161900393. The reversal of 161900384 is 483009161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 161900384.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194882 + ... + 195710.

It is an arithmetic number, because the mean of its divisors is an integer number (7059150).

Almost surely, 2^161900384 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 161900384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169419600).

161900384 is an abundant number, since it is smaller than the sum of its proper divisors (176938816).

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

161900384 is a wasteful number, since it uses less digits than its factorization.

161900384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215 (or 1207 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 161900384 is about 12724.0081735277. The cubic root of 161900384 is about 545.0244177260.

The spelling of 161900384 in words is "one hundred sixty-one million, nine hundred thousand, three hundred eighty-four".