620388 has 36 divisors (see below), whose sum is σ = 1652560. Its totient is φ = 195696.

The previous prime is 620383. The next prime is 620393. The reversal of 620388 is 883026.

620388 is a `hidden beast` number, since 620 + 38 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (620383) and next prime (620393).

It is a tau number, because it is divible by the number of its divisors (36).

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (620383) by changing a digit.

620388 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 231 + ... + 1137.

2⁶²⁰³⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (826280).

620388 is an abundant number, since it is smaller than the sum of its proper divisors (1032172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

620388 is a wasteful number, since it uses less digits than its factorization.

620388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936 (or 931 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 620388 is about 787.6471291130. The cubic root of 620388 is about 85.2879736686.

The spelling of 620388 in words is "six hundred twenty thousand, three hundred eighty-eight".