621969 has 8 divisors (see below), whose sum is σ = 835392. Its totient is φ = 411600.

The previous prime is 621941. The next prime is 621983. The reversal of 621969 is 969126.

It is a happy number.

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

It is not a de Polignac number, because 621969 - 2⁵ = 621937 is a prime.

It is a super-2 number, since 2×621969² = 773690873922, which contains 22 as substring.

It is a Curzon number.

621969 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (621769) 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, 234 + ... + 1139.

It is an arithmetic number, because the mean of its divisors is an integer number (104424).

2⁶²¹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

621969 is a deficient number, since it is larger than the sum of its proper divisors (213423).

621969 is a wasteful number, since it uses less digits than its factorization.

621969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527.

The product of its digits is 5832, while the sum is 33.

The square root of 621969 is about 788.6501125341. The cubic root of 621969 is about 85.3603616503.

The spelling of 621969 in words is "six hundred twenty-one thousand, nine hundred sixty-nine".