620999 has 2 divisors, whose sum is σ = 621000. Its totient is φ = 620998.

The previous prime is 620981. The next prime is 621007. The reversal of 620999 is 999026.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 620999 - 2⁸ = 620743 is a prime.

It is a Chen prime.

620999 is a modest number, since divided by 999 gives 620 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310499 + 310500.

It is an arithmetic number, because the mean of its divisors is an integer number (310500).

2⁶²⁰⁹⁹⁹ is an apocalyptic number.

620999 is a deficient number, since it is larger than the sum of its proper divisors (1).

620999 is an equidigital number, since it uses as much as digits as its factorization.

620999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 620999 is about 788.0348977044. The cubic root of 620999 is about 85.3159636006.

The spelling of 620999 in words is "six hundred twenty thousand, nine hundred ninety-nine".