164398639 has 4 divisors (see below), whose sum is σ = 164492424. Its totient is φ = 164304856.

The previous prime is 164398601. The next prime is 164398649. The reversal of 164398639 is 936893461.

164398639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 164398639 - 2¹⁵ = 164365871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164398592 and 164398601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164398649) 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, 44212 + ... + 47785.

It is an arithmetic number, because the mean of its divisors is an integer number (41123106).

Almost surely, 2^164398639 is an apocalyptic number.

164398639 is a deficient number, since it is larger than the sum of its proper divisors (93785).

164398639 is an equidigital number, since it uses as much as digits as its factorization.

164398639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93784.

The product of its digits is 839808, while the sum is 49.

The square root of 164398639 is about 12821.8032663116. The cubic root of 164398639 is about 547.8135110102.

The spelling of 164398639 in words is "one hundred sixty-four million, three hundred ninety-eight thousand, six hundred thirty-nine".