161405982 has 12 divisors (see below), whose sum is σ = 349713000. Its totient is φ = 53801988.

The previous prime is 161405957. The next prime is 161405983. The reversal of 161405982 is 289504161.

161405982 is a `hidden beast` number, since 1 + 61 + 4 + 0 + 598 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161405983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4483482 + ... + 4483517.

It is an arithmetic number, because the mean of its divisors is an integer number (29142750).

Almost surely, 2^161405982 is an apocalyptic number.

161405982 is an abundant number, since it is smaller than the sum of its proper divisors (188307018).

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

161405982 is a wasteful number, since it uses less digits than its factorization.

161405982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8967007 (or 8967004 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 161405982 is about 12704.5653998868. The cubic root of 161405982 is about 544.4690640571.

It can be divided in two parts, 16140 and 5982, that added together give a palindrome (22122).

The spelling of 161405982 in words is "one hundred sixty-one million, four hundred five thousand, nine hundred eighty-two".