621247842 has 12 divisors (see below), whose sum is σ = 1346037030. Its totient is φ = 207082608.

The previous prime is 621247829. The next prime is 621247853. The reversal of 621247842 is 248742126.

621247842 is a `hidden beast` number, since 621 + 24 + 7 + 8 + 4 + 2 = 666.

621247842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 501804801 + 119443041 = 22401^2 + 10929^2 .

It is a junction number, because it is equal to n+sod(n) for n = 621247797 and 621247806.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17256867 + ... + 17256902.

Almost surely, 2^621247842 is an apocalyptic number.

621247842 is an abundant number, since it is smaller than the sum of its proper divisors (724789188).

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

621247842 is a wasteful number, since it uses less digits than its factorization.

621247842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34513777 (or 34513774 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 621247842 is about 24924.8438711259. The cubic root of 621247842 is about 853.2735780029.

Adding to 621247842 its reverse (248742126), we get a palindrome (869989968).

The spelling of 621247842 in words is "six hundred twenty-one million, two hundred forty-seven thousand, eight hundred forty-two".