239421 has 16 divisors (see below), whose sum is σ = 393344. Its totient is φ = 126144.

The previous prime is 239417. The next prime is 239423. The reversal of 239421 is 124932.

It is not a de Polignac number, because 239421 - 2² = 239417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166 + ... + 711.

It is an arithmetic number, because the mean of its divisors is an integer number (24584).

2²³⁹⁴²¹ is an apocalyptic number.

239421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

239421 is a deficient number, since it is larger than the sum of its proper divisors (153923).

239421 is a wasteful number, since it uses less digits than its factorization.

239421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900.

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

The square root of 239421 is about 489.3066523153. The cubic root of 239421 is about 62.0946352210.

It can be divided in two parts, 2394 and 21, that added together give a triangular number (2415 = T₆₉).

The spelling of 239421 in words is "two hundred thirty-nine thousand, four hundred twenty-one".