161203860 has 144 divisors (see below), whose sum is σ = 522849600. Its totient is φ = 40061952.

The previous prime is 161203853. The next prime is 161203891. The reversal of 161203860 is 68302161.

161203860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 425151 + ... + 425529.

It is an arithmetic number, because the mean of its divisors is an integer number (3630900).

Almost surely, 2^161203860 is an apocalyptic number.

161203860 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 161203860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261424800).

161203860 is an abundant number, since it is smaller than the sum of its proper divisors (361645740).

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

161203860 is a wasteful number, since it uses less digits than its factorization.

161203860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 161203860 is about 12696.6082084941. The cubic root of 161203860 is about 544.2416971333.

The spelling of 161203860 in words is "one hundred sixty-one million, two hundred three thousand, eight hundred sixty".