621879 has 4 divisors (see below), whose sum is σ = 829176. Its totient is φ = 414584.

The previous prime is 621871. The next prime is 621883. The reversal of 621879 is 978126.

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

It is a cyclic number.

It is not a de Polignac number, because 621879 - 2³ = 621871 is a prime.

It is a D-number.

621879 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621871) 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, 103644 + ... + 103649.

It is an arithmetic number, because the mean of its divisors is an integer number (207294).

2⁶²¹⁸⁷⁹ is an apocalyptic number.

621879 is a deficient number, since it is larger than the sum of its proper divisors (207297).

621879 is a wasteful number, since it uses less digits than its factorization.

621879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207296.

The product of its digits is 6048, while the sum is 33.

The square root of 621879 is about 788.5930509458. The cubic root of 621879 is about 85.3562441873.

The spelling of 621879 in words is "six hundred twenty-one thousand, eight hundred seventy-nine".