161793638 has 8 divisors (see below), whose sum is σ = 253242288. Its totient is φ = 77379544.

The previous prime is 161793629. The next prime is 161793673. The reversal of 161793638 is 836397161.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 1758581 + ... + 1758672.

It is an arithmetic number, because the mean of its divisors is an integer number (31655286).

Almost surely, 2^161793638 is an apocalyptic number.

161793638 is a deficient number, since it is larger than the sum of its proper divisors (91448650).

161793638 is a wasteful number, since it uses less digits than its factorization.

161793638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517278.

The product of its digits is 163296, while the sum is 44.

The square root of 161793638 is about 12719.8128130881. The cubic root of 161793638 is about 544.9046074941.

The spelling of 161793638 in words is "one hundred sixty-one million, seven hundred ninety-three thousand, six hundred thirty-eight".