161403 has 16 divisors (see below), whose sum is σ = 241536. Its totient is φ = 95040.

The previous prime is 161387. The next prime is 161407. The reversal of 161403 is 304161.

It is not a de Polignac number, because 161403 - 2⁴ = 161387 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161403.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2175 + ... + 2247.

It is an arithmetic number, because the mean of its divisors is an integer number (15096).

2¹⁶¹⁴⁰³ is an apocalyptic number.

161403 is a deficient number, since it is larger than the sum of its proper divisors (80133).

161403 is a wasteful number, since it uses less digits than its factorization.

161403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 161403 is about 401.7499222153. The cubic root of 161403 is about 54.4465710987.

Adding to 161403 its reverse (304161), we get a palindrome (465564).

The spelling of 161403 in words is "one hundred sixty-one thousand, four hundred three".