621420 has 24 divisors (see below), whose sum is σ = 1740144. Its totient is φ = 165696.

The previous prime is 621419. The next prime is 621427. The reversal of 621420 is 24126.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 621420.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621420.

It is not an unprimeable number, because it can be changed into a prime (621427) 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, 5119 + ... + 5238.

It is an arithmetic number, because the mean of its divisors is an integer number (72506).

2⁶²¹⁴²⁰ is an apocalyptic number.

621420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

621420 is an abundant number, since it is smaller than the sum of its proper divisors (1118724).

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

621420 is a wasteful number, since it uses less digits than its factorization.

621420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10369 (or 10367 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 621420 is about 788.3019725968. The cubic root of 621420 is about 85.3352389440.

Adding to 621420 its reverse (24126), we get a palindrome (645546).

The spelling of 621420 in words is "six hundred twenty-one thousand, four hundred twenty".