621120 has 56 divisors (see below), whose sum is σ = 1975104. Its totient is φ = 165376.

The previous prime is 621113. The next prime is 621133. The reversal of 621120 is 21126.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 621096 and 621105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637 + ... + 1283.

2⁶²¹¹²⁰ is an apocalyptic number.

621120 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 621120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987552).

621120 is an abundant number, since it is smaller than the sum of its proper divisors (1353984).

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

621120 is a wasteful number, since it uses less digits than its factorization.

621120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 621120 is about 788.1116672147. Note that the first 3 decimals coincide. The cubic root of 621120 is about 85.3215044367.

Adding to 621120 its reverse (21126), we get a palindrome (642246).

It can be divided in two parts, 621 and 120, that added together give a triangular number (741 = T₃₈).

The spelling of 621120 in words is "six hundred twenty-one thousand, one hundred twenty".