208742 has 16 divisors (see below), whose sum is σ = 334800. Its totient is φ = 97440.

The previous prime is 208739. The next prime is 208759. The reversal of 208742 is 247802.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3392 + ... + 3452.

It is an arithmetic number, because the mean of its divisors is an integer number (20925).

2²⁰⁸⁷⁴² is an apocalyptic number.

208742 is a deficient number, since it is larger than the sum of its proper divisors (126058).

208742 is a wasteful number, since it uses less digits than its factorization.

208742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 208742 is about 456.8829171681. The cubic root of 208742 is about 59.3202919899.

Subtracting 208742 from its reverse (247802), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 208742 in words is "two hundred eight thousand, seven hundred forty-two".