621442 has 4 divisors (see below), whose sum is σ = 932166. Its totient is φ = 310720.

The previous prime is 621431. The next prime is 621443. The reversal of 621442 is 244126.

621442 is nontrivially palindromic in base 9.

621442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 549081 + 72361 = 741^2 + 269^2 .

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (621443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155359 + ... + 155362.

2⁶²¹⁴⁴² is an apocalyptic number.

621442 is a deficient number, since it is larger than the sum of its proper divisors (310724).

621442 is a wasteful number, since it uses less digits than its factorization.

621442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310723.

The product of its digits is 384, while the sum is 19.

The square root of 621442 is about 788.3159265168. The cubic root of 621442 is about 85.3362459672.

Adding to 621442 its reverse (244126), we get a palindrome (865568).

The spelling of 621442 in words is "six hundred twenty-one thousand, four hundred forty-two".