213942 has 16 divisors (see below), whose sum is σ = 432432. Its totient is φ = 70560.

The previous prime is 213929. The next prime is 213943. The reversal of 213942 is 249312.

It is an Ulam number.

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 213942.

It is not an unprimeable number, because it can be changed into a prime (213943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 988 + ... + 1184.

It is an arithmetic number, because the mean of its divisors is an integer number (27027).

2²¹³⁹⁴² is an apocalyptic number.

213942 is an abundant number, since it is smaller than the sum of its proper divisors (218490).

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

213942 is a wasteful number, since it uses less digits than its factorization.

213942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383.

The product of its digits is 432, while the sum is 21.

The square root of 213942 is about 462.5386470340. The cubic root of 213942 is about 59.8088360302.

The spelling of 213942 in words is "two hundred thirteen thousand, nine hundred forty-two".