208137998 has 4 divisors (see below), whose sum is σ = 312207000. Its totient is φ = 104068998.

The previous prime is 208137983. The next prime is 208138003. The reversal of 208137998 is 899731802.

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

It is a super-2 number, since 2×208137998² = 86642852422896008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52034498 + ... + 52034501.

It is an arithmetic number, because the mean of its divisors is an integer number (78051750).

Almost surely, 2^208137998 is an apocalyptic number.

208137998 is a deficient number, since it is larger than the sum of its proper divisors (104069002).

208137998 is a wasteful number, since it uses less digits than its factorization.

208137998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104069001.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 208137998 is about 14426.9885284490. The cubic root of 208137998 is about 592.6302162953.

The spelling of 208137998 in words is "two hundred eight million, one hundred thirty-seven thousand, nine hundred ninety-eight".