621957 has 12 divisors (see below), whose sum is σ = 964896. Its totient is φ = 355320.

The previous prime is 621941. The next prime is 621983. The reversal of 621957 is 759126.

It is not a de Polignac number, because 621957 - 2⁴ = 621941 is a prime.

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 (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1969 + ... + 2262.

It is an arithmetic number, because the mean of its divisors is an integer number (80408).

2⁶²¹⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

621957 is a deficient number, since it is larger than the sum of its proper divisors (342939).

621957 is a wasteful number, since it uses less digits than its factorization.

621957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4248 (or 4241 counting only the distinct ones).

The product of its digits is 3780, while the sum is 30.

The square root of 621957 is about 788.6425045608. The cubic root of 621957 is about 85.3598126782.

The spelling of 621957 in words is "six hundred twenty-one thousand, nine hundred fifty-seven".