621942 has 8 divisors (see below), whose sum is σ = 1243896. Its totient is φ = 207312.

The previous prime is 621941. The next prime is 621983. The reversal of 621942 is 249126.

It is a sphenic number, since it is the product of 3 distinct primes.

621942 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51823 + ... + 51834.

It is an arithmetic number, because the mean of its divisors is an integer number (155487).

2⁶²¹⁹⁴² is an apocalyptic number.

621942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

621942 is a wasteful number, since it uses less digits than its factorization.

621942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103662.

The product of its digits is 864, while the sum is 24.

The square root of 621942 is about 788.6329944911. The cubic root of 621942 is about 85.3591264531.

Subtracting from 621942 its reverse (249126), we obtain a triangular number (372816 = T₈₆₃).

The spelling of 621942 in words is "six hundred twenty-one thousand, nine hundred forty-two".