621340 has 24 divisors (see below), whose sum is σ = 1334592. Its totient is φ = 242880.

The previous prime is 621337. The next prime is 621343. The reversal of 621340 is 43126.

It is an interprime number because it is at equal distance from previous prime (621337) and next prime (621343).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621343) 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 7 ways as a sum of consecutive naturals, for example, 610 + ... + 1270.

It is an arithmetic number, because the mean of its divisors is an integer number (55608).

2⁶²¹³⁴⁰ is an apocalyptic number.

It is an amenable number.

621340 is an abundant number, since it is smaller than the sum of its proper divisors (713252).

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

621340 is a wasteful number, since it uses less digits than its factorization.

621340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717 (or 715 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 621340 is about 788.2512289873. The cubic root of 621340 is about 85.3315768410.

Adding to 621340 its reverse (43126), we get a palindrome (664466).

It can be divided in two parts, 621 and 340, that added together give a square (961 = 31²).

The spelling of 621340 in words is "six hundred twenty-one thousand, three hundred forty".