621967 has 4 divisors (see below), whose sum is σ = 629920. Its totient is φ = 614016.

The previous prime is 621941. The next prime is 621983. The reversal of 621967 is 769126.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621967 is a prime.

It is a Duffinian number.

621967 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3858 + ... + 4015.

It is an arithmetic number, because the mean of its divisors is an integer number (157480).

2⁶²¹⁹⁶⁷ is an apocalyptic number.

621967 is a deficient number, since it is larger than the sum of its proper divisors (7953).

621967 is an equidigital number, since it uses as much as digits as its factorization.

621967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7952.

The product of its digits is 4536, while the sum is 31.

The square root of 621967 is about 788.6488445436. The cubic root of 621967 is about 85.3602701555.

The spelling of 621967 in words is "six hundred twenty-one thousand, nine hundred sixty-seven".