161992406 has 16 divisors (see below), whose sum is σ = 247870800. Its totient is φ = 79377408.

The previous prime is 161992387. The next prime is 161992417. The reversal of 161992406 is 604299161.

161992406 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 161992406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39710 + ... + 43598.

It is an arithmetic number, because the mean of its divisors is an integer number (15491925).

Almost surely, 2^161992406 is an apocalyptic number.

161992406 is a deficient number, since it is larger than the sum of its proper divisors (85878394).

161992406 is a wasteful number, since it uses less digits than its factorization.

161992406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4303.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 161992406 is about 12727.6237373675. The cubic root of 161992406 is about 545.1276596833.

The spelling of 161992406 in words is "one hundred sixty-one million, nine hundred ninety-two thousand, four hundred six".