164404427 has 8 divisors (see below), whose sum is σ = 181200432. Its totient is φ = 147916800.

The previous prime is 164404423. The next prime is 164404459. The reversal of 164404427 is 724404461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 164404427 - 2² = 164404423 is a prime.

It is a super-3 number, since 3×164404427³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164404393 and 164404402.

It is not an unprimeable number, because it can be changed into a prime (164404423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75974 + ... + 78107.

It is an arithmetic number, because the mean of its divisors is an integer number (22650054).

Almost surely, 2^164404427 is an apocalyptic number.

164404427 is a deficient number, since it is larger than the sum of its proper divisors (16796005).

164404427 is a wasteful number, since it uses less digits than its factorization.

164404427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154189.

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 164404427 is about 12822.0289736063. The cubic root of 164404427 is about 547.8199399105.

Adding to 164404427 its reverse (724404461), we get a palindrome (888808888).

The spelling of 164404427 in words is "one hundred sixty-four million, four hundred four thousand, four hundred twenty-seven".