208390249390 has 8 divisors (see below), whose sum is σ = 375102448920. Its totient is φ = 83356099752.

The previous prime is 208390249373. The next prime is 208390249433. The reversal of 208390249390 is 93942093802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10419512460 + ... + 10419512479.

It is an arithmetic number, because the mean of its divisors is an integer number (46887806115).

Almost surely, 2^208390249390 is an apocalyptic number.

208390249390 is a deficient number, since it is larger than the sum of its proper divisors (166712199530).

208390249390 is a wasteful number, since it uses less digits than its factorization.

208390249390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20839024946.

The product of its (nonzero) digits is 839808, while the sum is 49.

The spelling of 208390249390 in words is "two hundred eight billion, three hundred ninety million, two hundred forty-nine thousand, three hundred ninety".