161193840 has 80 divisors (see below), whose sum is σ = 501435168. Its totient is φ = 42835968.

The previous prime is 161193839. The next prime is 161193869. The reversal of 161193840 is 48391161.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79884 + ... + 81876.

Almost surely, 2^161193840 is an apocalyptic number.

161193840 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 161193840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250717584).

161193840 is an abundant number, since it is smaller than the sum of its proper divisors (340241328).

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

161193840 is a wasteful number, since it uses less digits than its factorization.

161193840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346 (or 2340 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 161193840 is about 12696.2136087890. The cubic root of 161193840 is about 544.2304206978.

The spelling of 161193840 in words is "one hundred sixty-one million, one hundred ninety-three thousand, eight hundred forty".