161404 has 6 divisors (see below), whose sum is σ = 282464. Its totient is φ = 80700.

The previous prime is 161387. The next prime is 161407. The reversal of 161404 is 404161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20172 + ... + 20179.

2¹⁶¹⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

161404 is a deficient number, since it is larger than the sum of its proper divisors (121060).

161404 is a wasteful number, since it uses less digits than its factorization.

161404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40355 (or 40353 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 161404 is about 401.7511667687. The cubic root of 161404 is about 54.4466835428.

Adding to 161404 its reverse (404161), we get a palindrome (565565).

It can be divided in two parts, 161 and 404, that added together give a palindrome (565).

The spelling of 161404 in words is "one hundred sixty-one thousand, four hundred four".