208442642 has 4 divisors (see below), whose sum is σ = 312663966. Its totient is φ = 104221320.

The previous prime is 208442599. The next prime is 208442651. The reversal of 208442642 is 246244802.

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

It can be written as a sum of positive squares in only one way, i.e., 173738761 + 34703881 = 13181^2 + 5891^2 .

It is a junction number, because it is equal to n+sod(n) for n = 208442599 and 208442608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52110659 + ... + 52110662.

Almost surely, 2^208442642 is an apocalyptic number.

208442642 is a deficient number, since it is larger than the sum of its proper divisors (104221324).

208442642 is a wasteful number, since it uses less digits than its factorization.

208442642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104221323.

The product of its (nonzero) digits is 24576, while the sum is 32.

The square root of 208442642 is about 14437.5427964734. The cubic root of 208442642 is about 592.9192124246.

The spelling of 208442642 in words is "two hundred eight million, four hundred forty-two thousand, six hundred forty-two".