621478239 has 16 divisors (see below), whose sum is σ = 910176000. Its totient is φ = 375446016.

The previous prime is 621478229. The next prime is 621478241. The reversal of 621478239 is 932874126.

It is not a de Polignac number, because 621478239 - 2¹⁵ = 621445471 is a prime.

It is a super-2 number, since 2×621478239² = 772470403101082242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 621478239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621478219) 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 15 ways as a sum of consecutive naturals, for example, 235714 + ... + 238335.

It is an arithmetic number, because the mean of its divisors is an integer number (56886000).

Almost surely, 2^621478239 is an apocalyptic number.

621478239 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

621478239 is a deficient number, since it is larger than the sum of its proper divisors (288697761).

621478239 is a wasteful number, since it uses less digits than its factorization.

621478239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474094.

The product of its digits is 145152, while the sum is 42.

The square root of 621478239 is about 24929.4652770572. The cubic root of 621478239 is about 853.3790471150.

The spelling of 621478239 in words is "six hundred twenty-one million, four hundred seventy-eight thousand, two hundred thirty-nine".