208436380789 has 128 divisors (see below), whose sum is σ = 291145809920. Its totient is φ = 144614937600.

The previous prime is 208436380787. The next prime is 208436380807. The reversal of 208436380789 is 987083634802.

It is not a de Polignac number, because 208436380789 - 2¹ = 208436380787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208436380781) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 120972082 + ... + 120973804.

It is an arithmetic number, because the mean of its divisors is an integer number (2274576640).

Almost surely, 2^208436380789 is an apocalyptic number.

It is an amenable number.

208436380789 is a deficient number, since it is larger than the sum of its proper divisors (82709429131).

208436380789 is a wasteful number, since it uses less digits than its factorization.

208436380789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891.

The product of its (nonzero) digits is 13934592, while the sum is 58.

The spelling of 208436380789 in words is "two hundred eight billion, four hundred thirty-six million, three hundred eighty thousand, seven hundred eighty-nine".