164406433 has 4 divisors (see below), whose sum is σ = 168416388. Its totient is φ = 160396480.

The previous prime is 164406421. The next prime is 164406443. The reversal of 164406433 is 334604461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88228449 + 76177984 = 9393^2 + 8728^2 .

It is a cyclic number.

It is not a de Polignac number, because 164406433 - 2⁵ = 164406401 is a prime.

It is a super-3 number, since 3×164406433³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164406395 and 164406404.

It is not an unprimeable number, because it can be changed into a prime (164406413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004916 + ... + 2004997.

It is an arithmetic number, because the mean of its divisors is an integer number (42104097).

Almost surely, 2^164406433 is an apocalyptic number.

It is an amenable number.

164406433 is a deficient number, since it is larger than the sum of its proper divisors (4009955).

164406433 is an equidigital number, since it uses as much as digits as its factorization.

164406433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009954.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 164406433 is about 12822.1071981169. The cubic root of 164406433 is about 547.8221679980.

The spelling of 164406433 in words is "one hundred sixty-four million, four hundred six thousand, four hundred thirty-three".