169408139 has 4 divisors (see below), whose sum is σ = 169586856. Its totient is φ = 169229424.

The previous prime is 169408091. The next prime is 169408157. The reversal of 169408139 is 931804961.

169408139 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 a de Polignac number, because none of the positive numbers 2^k-169408139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 169408096 and 169408105.

It is not an unprimeable number, because it can be changed into a prime (169408159) 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, 87929 + ... + 89834.

It is an arithmetic number, because the mean of its divisors is an integer number (42396714).

Almost surely, 2^169408139 is an apocalyptic number.

169408139 is a deficient number, since it is larger than the sum of its proper divisors (178717).

169408139 is an equidigital number, since it uses as much as digits as its factorization.

169408139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178716.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 169408139 is about 13015.6881877218. The cubic root of 169408139 is about 553.3221942968.

The spelling of 169408139 in words is "one hundred sixty-nine million, four hundred eight thousand, one hundred thirty-nine".