621981238 has 8 divisors (see below), whose sum is σ = 933784488. Its totient is φ = 310719744.

The previous prime is 621981187. The next prime is 621981247. The reversal of 621981238 is 832189126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 621981238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132556 + ... + 137167.

It is an arithmetic number, because the mean of its divisors is an integer number (116723061).

Almost surely, 2^621981238 is an apocalyptic number.

621981238 is a deficient number, since it is larger than the sum of its proper divisors (311803250).

621981238 is a wasteful number, since it uses less digits than its factorization.

621981238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270878.

The product of its digits is 41472, while the sum is 40.

The square root of 621981238 is about 24939.5516800122. The cubic root of 621981238 is about 853.6092150313.

It can be divided in two parts, 62198 and 1238, that added together give a palindrome (63436).

The spelling of 621981238 in words is "six hundred twenty-one million, nine hundred eighty-one thousand, two hundred thirty-eight".