161394018 has 32 divisors (see below), whose sum is σ = 340866240. Its totient is φ = 50803200.

The previous prime is 161394017. The next prime is 161394031. The reversal of 161394018 is 810493161.

It is a self number, because there is not a number n which added to its sum of digits gives 161394018.

It is not an unprimeable number, because it can be changed into a prime (161394017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36318 + ... + 40518.

It is an arithmetic number, because the mean of its divisors is an integer number (10652070).

Almost surely, 2^161394018 is an apocalyptic number.

161394018 is an abundant number, since it is smaller than the sum of its proper divisors (179472222).

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

161394018 is a wasteful number, since it uses less digits than its factorization.

161394018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4562.

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

The square root of 161394018 is about 12704.0945368019. The cubic root of 161394018 is about 544.4556110471.

The spelling of 161394018 in words is "one hundred sixty-one million, three hundred ninety-four thousand, eighteen".