621384 has 32 divisors (see below), whose sum is σ = 1645920. Its totient is φ = 194816.

The previous prime is 621371. The next prime is 621389. The reversal of 621384 is 483126.

It is a happy number.

621384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×621384² = 772236150912, which contains 22 as substring.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is one of the 548 Lynch-Bell numbers.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (621389) by changing a digit.

621384 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354 + ... + 1169.

It is an arithmetic number, because the mean of its divisors is an integer number (51435).

2⁶²¹³⁸⁴ is an apocalyptic number.

It is an amenable number.

621384 is an abundant number, since it is smaller than the sum of its proper divisors (1024536).

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

621384 is a wasteful number, since it uses less digits than its factorization.

621384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549 (or 1545 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 621384 is about 788.2791383768. The cubic root of 621384 is about 85.3335910365. Note that the first 3 decimals are identical.

The spelling of 621384 in words is "six hundred twenty-one thousand, three hundred eighty-four".