161405404 has 6 divisors (see below), whose sum is σ = 282459464. Its totient is φ = 80702700.

The previous prime is 161405401. The next prime is 161405411. The reversal of 161405404 is 404504161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161405401) by changing a digit.

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 as a sum of consecutive naturals, namely, 20175672 + ... + 20175679.

Almost surely, 2^161405404 is an apocalyptic number.

It is an amenable number.

161405404 is a deficient number, since it is larger than the sum of its proper divisors (121054060).

161405404 is a wasteful number, since it uses less digits than its factorization.

161405404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40351355 (or 40351353 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 161405404 is about 12704.5426521383. The cubic root of 161405404 is about 544.4684141359.

Adding to 161405404 its reverse (404504161), we get a palindrome (565909565).

The spelling of 161405404 in words is "one hundred sixty-one million, four hundred five thousand, four hundred four".