621342 has 12 divisors (see below), whose sum is σ = 1346280. Its totient is φ = 207108.

The previous prime is 621337. The next prime is 621343. The reversal of 621342 is 243126.

It is a happy number.

621342 is a `hidden beast` number, since 621 + 3 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 34519 = 621342 / (6 + 2 + 1 + 3 + 4 + 2).

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 621342.

It is not an unprimeable number, because it can be changed into a prime (621343) by changing a digit.

621342 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17242 + ... + 17277.

It is an arithmetic number, because the mean of its divisors is an integer number (112190).

2⁶²¹³⁴² is an apocalyptic number.

621342 is an abundant number, since it is smaller than the sum of its proper divisors (724938).

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

621342 is a wasteful number, since it uses less digits than its factorization.

621342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34527 (or 34524 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 621342 is about 788.2524976174. The cubic root of 621342 is about 85.3316683974.

Adding to 621342 its reverse (243126), we get a palindrome (864468).

The spelling of 621342 in words is "six hundred twenty-one thousand, three hundred forty-two".