161829980 has 24 divisors (see below), whose sum is σ = 365985312. Its totient is φ = 59752512.

The previous prime is 161829937. The next prime is 161830003. The reversal of 161829980 is 89928161.

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, 310952 + ... + 311471.

It is an arithmetic number, because the mean of its divisors is an integer number (15249388).

Almost surely, 2^161829980 is an apocalyptic number.

161829980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161829980 is an abundant number, since it is smaller than the sum of its proper divisors (204155332).

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

161829980 is a wasteful number, since it uses less digits than its factorization.

161829980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622445 (or 622443 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 161829980 is about 12721.2412916350. The cubic root of 161829980 is about 544.9454031664.

It can be divided in two parts, 16182 and 9980, that added together give a palindrome (26162).

The spelling of 161829980 in words is "one hundred sixty-one million, eight hundred twenty-nine thousand, nine hundred eighty".