620440 has 16 divisors (see below), whose sum is σ = 1396080. Its totient is φ = 248160.

The previous prime is 620437. The next prime is 620441. The reversal of 620440 is 44026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7716 + ... + 7795.

It is an arithmetic number, because the mean of its divisors is an integer number (87255).

2⁶²⁰⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

620440 is an abundant number, since it is smaller than the sum of its proper divisors (775640).

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

620440 is a wasteful number, since it uses less digits than its factorization.

620440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15522 (or 15518 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 620440 is about 787.6801381271. The cubic root of 620440 is about 85.2903565057.

Adding to 620440 its reverse (44026), we get a palindrome (664466).

It can be divided in two parts, 6204 and 40, that multiplied together give a triangular number (248160 = T₇₀₄).

The spelling of 620440 in words is "six hundred twenty thousand, four hundred forty".