622440 has 192 divisors, whose sum is σ = 2620800. Its totient is φ = 124416.

The previous prime is 622423. The next prime is 622477. The reversal of 622440 is 44226.

622440 is a `hidden beast` number, since 622 + 4 + 40 = 666.

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

It is a congruent number.

It is an unprimeable number.

622440 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 47 ways as a sum of consecutive naturals, for example, 32751 + ... + 32769.

It is an arithmetic number, because the mean of its divisors is an integer number (13650).

2⁶²²⁴⁴⁰ is an apocalyptic number.

622440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 622440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1310400).

622440 is an abundant number, since it is smaller than the sum of its proper divisors (1998360).

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

622440 is a wasteful number, since it uses less digits than its factorization.

622440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 622440 is about 788.9486675317. The cubic root of 622440 is about 85.3819032309.

Adding to 622440 its reverse (44226), we get a palindrome (666666).

The spelling of 622440 in words is "six hundred twenty-two thousand, four hundred forty".