161406210 has 64 divisors (see below), whose sum is σ = 454701312. Its totient is φ = 35894016.

The previous prime is 161406191. The next prime is 161406221. The reversal of 161406210 is 12604161.

161406210 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-3 number, since 3×161406210³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 2617 + ... + 18156.

It is an arithmetic number, because the mean of its divisors is an integer number (7104708).

Almost surely, 2^161406210 is an apocalyptic number.

161406210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161406210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227350656).

161406210 is an abundant number, since it is smaller than the sum of its proper divisors (293295102).

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

161406210 is a wasteful number, since it uses less digits than its factorization.

161406210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20827.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 161406210 is about 12704.5743730359. The cubic root of 161406210 is about 544.4693204269.

The spelling of 161406210 in words is "one hundred sixty-one million, four hundred six thousand, two hundred ten".