161976398 has 16 divisors (see below), whose sum is σ = 245850000. Its totient is φ = 80030592.

The previous prime is 161976389. The next prime is 161976401. The reversal of 161976398 is 893679161.

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, 108038 + ... + 109526.

It is an arithmetic number, because the mean of its divisors is an integer number (15365625).

Almost surely, 2^161976398 is an apocalyptic number.

161976398 is a deficient number, since it is larger than the sum of its proper divisors (83873602).

161976398 is a wasteful number, since it uses less digits than its factorization.

161976398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099.

The product of its digits is 489888, while the sum is 50.

The square root of 161976398 is about 12726.9948534601. The cubic root of 161976398 is about 545.1097026872.

The spelling of 161976398 in words is "one hundred sixty-one million, nine hundred seventy-six thousand, three hundred ninety-eight".