620391 has 8 divisors (see below), whose sum is σ = 831744. Its totient is φ = 411320.

The previous prime is 620383. The next prime is 620393. The reversal of 620391 is 193026.

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

It is a cyclic number.

It is not a de Polignac number, because 620391 - 2³ = 620383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620393) 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 7 ways as a sum of consecutive naturals, for example, 226 + ... + 1136.

It is an arithmetic number, because the mean of its divisors is an integer number (103968).

2⁶²⁰³⁹¹ is an apocalyptic number.

620391 is a deficient number, since it is larger than the sum of its proper divisors (211353).

620391 is a wasteful number, since it uses less digits than its factorization.

620391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 620391 is about 787.6490335168. The cubic root of 620391 is about 85.2881111436.

The spelling of 620391 in words is "six hundred twenty thousand, three hundred ninety-one".