164438399 has 6 divisors (see below), whose sum is σ = 174680544. Its totient is φ = 154765280.

The previous prime is 164438389. The next prime is 164438423. The reversal of 164438399 is 993834461.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-164438399 is a prime.

It is a super-3 number, since 3×164438399³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164438359) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 284207 + ... + 284784.

It is an arithmetic number, because the mean of its divisors is an integer number (29113424).

Almost surely, 2^164438399 is an apocalyptic number.

164438399 is a deficient number, since it is larger than the sum of its proper divisors (10242145).

164438399 is an equidigital number, since it uses as much as digits as its factorization.

164438399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569025 (or 569008 counting only the distinct ones).

The product of its digits is 559872, while the sum is 47.

The square root of 164438399 is about 12823.3536565128. The cubic root of 164438399 is about 547.8576705597.

It can be divided in two parts, 16443 and 8399, that added together give a palindrome (24842).

The spelling of 164438399 in words is "one hundred sixty-four million, four hundred thirty-eight thousand, three hundred ninety-nine".