208289642 has 12 divisors (see below), whose sum is σ = 343420098. Its totient is φ = 94677000.

The previous prime is 208289639. The next prime is 208289657. The reversal of 208289642 is 246982802.

It can be written as a sum of positive squares in only one way, i.e., 207331201 + 958441 = 14399^2 + 979^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 208289642.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 430109 + ... + 430592.

Almost surely, 2^208289642 is an apocalyptic number.

208289642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

208289642 is a deficient number, since it is larger than the sum of its proper divisors (135130456).

208289642 is a wasteful number, since it uses less digits than its factorization.

208289642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860725 (or 860714 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 208289642 is about 14432.2431381958. The cubic root of 208289642 is about 592.7741064081.

The spelling of 208289642 in words is "two hundred eight million, two hundred eighty-nine thousand, six hundred forty-two".