209142 has 20 divisors (see below), whose sum is σ = 468996. Its totient is φ = 69660.

The previous prime is 209123. The next prime is 209147. The reversal of 209142 is 241902.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 209142.

It is not an unprimeable number, because it can be changed into a prime (209147) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 484 + ... + 807.

2²⁰⁹¹⁴² is an apocalyptic number.

209142 is an abundant number, since it is smaller than the sum of its proper divisors (259854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209142 is a wasteful number, since it uses less digits than its factorization.

209142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305 (or 1296 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 209142 is about 457.3204565729. The cubic root of 209142 is about 59.3581584736.

It can be divided in two parts, 209 and 142, that added together give a triangular number (351 = T₂₆).

The spelling of 209142 in words is "two hundred nine thousand, one hundred forty-two".