161994360 has 128 divisors (see below), whose sum is σ = 561427200. Its totient is φ = 36956160.

The previous prime is 161994331. The next prime is 161994389. The reversal of 161994360 is 63499161.

It is an interprime number because it is at equal distance from previous prime (161994331) and next prime (161994389).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 18831 + ... + 26049.

It is an arithmetic number, because the mean of its divisors is an integer number (4386150).

Almost surely, 2^161994360 is an apocalyptic number.

161994360 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 161994360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280713600).

161994360 is an abundant number, since it is smaller than the sum of its proper divisors (399432840).

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

161994360 is a wasteful number, since it uses less digits than its factorization.

161994360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7261 (or 7257 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 161994360 is about 12727.7004993047. The cubic root of 161994360 is about 545.1298515045.

The spelling of 161994360 in words is "one hundred sixty-one million, nine hundred ninety-four thousand, three hundred sixty".