208156389 has 16 divisors (see below), whose sum is σ = 321208320. Its totient is φ = 117439920.

The previous prime is 208156367. The next prime is 208156391. The reversal of 208156389 is 983651802.

208156389 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 208156389 - 2⁷ = 208156261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 208156389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208156349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61077 + ... + 64394.

It is an arithmetic number, because the mean of its divisors is an integer number (20075520).

Almost surely, 2^208156389 is an apocalyptic number.

It is an amenable number.

208156389 is a deficient number, since it is larger than the sum of its proper divisors (113051931).

208156389 is a wasteful number, since it uses less digits than its factorization.

208156389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125560.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 208156389 is about 14427.6258961757. The cubic root of 208156389 is about 592.6476706468.

The spelling of 208156389 in words is "two hundred eight million, one hundred fifty-six thousand, three hundred eighty-nine".