180406 has 4 divisors (see below), whose sum is σ = 270612. Its totient is φ = 90202.

The previous prime is 180391. The next prime is 180413. The reversal of 180406 is 604081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604081 = 101 ⋅5981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45100 + ... + 45103.

It is an arithmetic number, because the mean of its divisors is an integer number (67653).

2¹⁸⁰⁴⁰⁶ is an apocalyptic number.

180406 is a deficient number, since it is larger than the sum of its proper divisors (90206).

180406 is an equidigital number, since it uses as much as digits as its factorization.

180406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90205.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 180406 is about 424.7422747973. The cubic root of 180406 is about 56.5045810367.

Adding to 180406 its reverse (604081), we get a palindrome (784487).

The spelling of 180406 in words is "one hundred eighty thousand, four hundred six".