621140 has 24 divisors (see below), whose sum is σ = 1405320. Its totient is φ = 229248.

The previous prime is 621139. The next prime is 621143. The reversal of 621140 is 41126.

621140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 196 + 620944 = 14^2 + 788^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621143) 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, 935 + ... + 1454.

It is an arithmetic number, because the mean of its divisors is an integer number (58555).

2⁶²¹¹⁴⁰ is an apocalyptic number.

It is an amenable number.

621140 is an abundant number, since it is smaller than the sum of its proper divisors (784180).

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

621140 is a wasteful number, since it uses less digits than its factorization.

621140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411 (or 2409 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 621140 is about 788.1243556698. The cubic root of 621140 is about 85.3224202081.

Subtracting from 621140 its sum of digits (14), we obtain a palindrome (621126).

Adding to 621140 its reverse (41126), we get a palindrome (662266).

The spelling of 621140 in words is "six hundred twenty-one thousand, one hundred forty".