208412420138 has 16 divisors (see below), whose sum is σ = 337465917096. Its totient is φ = 95961862080.

The previous prime is 208412420137. The next prime is 208412420149. The reversal of 208412420138 is 831024214802.

It can be written as a sum of positive squares in 4 ways, for example, as 92402016529 + 116010403609 = 303977^2 + 340603^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 208412420098 and 208412420107.

It is not an unprimeable number, because it can be changed into a prime (208412420137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9509081 + ... + 9530972.

Almost surely, 2^208412420138 is an apocalyptic number.

208412420138 is a deficient number, since it is larger than the sum of its proper divisors (129053496958).

208412420138 is a wasteful number, since it uses less digits than its factorization.

208412420138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19040489.

The product of its (nonzero) digits is 24576, while the sum is 35.

The spelling of 208412420138 in words is "two hundred eight billion, four hundred twelve million, four hundred twenty thousand, one hundred thirty-eight".