208138995 has 12 divisors (see below), whose sum is σ = 360774336. Its totient is φ = 111007440.

The previous prime is 208138981. The next prime is 208139027. The reversal of 208138995 is 599831802.

It is a happy number.

It is not a de Polignac number, because 208138995 - 2¹¹ = 208136947 is a prime.

It is a super-2 number, since 2×208138995² = 86643682479220050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 4625311 = 208138995 / (2 + 0 + 8 + 1 + 3 + 8 + 9 + 9 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 208138995.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2312611 + ... + 2312700.

It is an arithmetic number, because the mean of its divisors is an integer number (30064528).

Almost surely, 2^208138995 is an apocalyptic number.

208138995 is a deficient number, since it is larger than the sum of its proper divisors (152635341).

208138995 is a wasteful number, since it uses less digits than its factorization.

208138995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4625322 (or 4625319 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 208138995 is about 14427.0230817033. The cubic root of 208138995 is about 592.6311625448.

The spelling of 208138995 in words is "two hundred eight million, one hundred thirty-eight thousand, nine hundred ninety-five".