621965 has 8 divisors (see below), whose sum is σ = 785760. Its totient is φ = 471312.

The previous prime is 621941. The next prime is 621983. The reversal of 621965 is 569126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621965 is a prime.

It is a super-2 number, since 2×621965² = 773680922450, which contains 22 as substring.

It is a congruent number.

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, 3179 + ... + 3368.

It is an arithmetic number, because the mean of its divisors is an integer number (98220).

2⁶²¹⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

621965 is a deficient number, since it is larger than the sum of its proper divisors (163795).

621965 is a wasteful number, since it uses less digits than its factorization.

621965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6571.

The product of its digits is 3240, while the sum is 29.

The square root of 621965 is about 788.6475765511. The cubic root of 621965 is about 85.3601786604.

The spelling of 621965 in words is "six hundred twenty-one thousand, nine hundred sixty-five".