621243 has 32 divisors (see below), whose sum is σ = 1113600. Its totient is φ = 334368.

The previous prime is 621241. The next prime is 621259. The reversal of 621243 is 342126.

It is a happy number.

621243 is a `hidden beast` number, since 621 + 2 + 43 = 666.

It is not a de Polignac number, because 621243 - 2¹ = 621241 is a prime.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (621241) 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 31 ways as a sum of consecutive naturals, for example, 3505 + ... + 3677.

It is an arithmetic number, because the mean of its divisors is an integer number (34800).

2⁶²¹²⁴³ is an apocalyptic number.

621243 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

621243 is a deficient number, since it is larger than the sum of its proper divisors (492357).

621243 is a wasteful number, since it uses less digits than its factorization.

621243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 202 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 621243 is about 788.1896979789. The cubic root of 621243 is about 85.3271361195.

Adding to 621243 its reverse (342126), we get a palindrome (963369).

The spelling of 621243 in words is "six hundred twenty-one thousand, two hundred forty-three".