164440425 has 24 divisors (see below), whose sum is σ = 274294944. Its totient is φ = 86920960.

The previous prime is 164440403. The next prime is 164440429. The reversal of 164440425 is 524044461.

It is a happy number.

164440425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 164440425 - 2¹² = 164436329 is a prime.

It is a super-3 number, since 3×164440425³ (a number of 26 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 164440392 and 164440401.

It is not an unprimeable number, because it can be changed into a prime (164440429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1227 + ... + 18176.

It is an arithmetic number, because the mean of its divisors is an integer number (11428956).

Almost surely, 2^164440425 is an apocalyptic number.

164440425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164440425 is a deficient number, since it is larger than the sum of its proper divisors (109854519).

164440425 is a wasteful number, since it uses less digits than its factorization.

164440425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19529 (or 19524 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 164440425 is about 12823.4326527650. The cubic root of 164440425 is about 547.8599205514.

Adding to 164440425 its reverse (524044461), we get a palindrome (688484886).

The spelling of 164440425 in words is "one hundred sixty-four million, four hundred forty thousand, four hundred twenty-five".