621404127 has 6 divisors (see below), whose sum is σ = 897583752. Its totient is φ = 414269412.

The previous prime is 621404099. The next prime is 621404129. The reversal of 621404127 is 721404126.

It is not a de Polignac number, because 621404127 - 2¹⁴ = 621387743 is a prime.

It is a super-2 number, since 2×621404127² = 772286178105264258, 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 621404127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621404129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34522443 + ... + 34522460.

It is an arithmetic number, because the mean of its divisors is an integer number (149597292).

Almost surely, 2^621404127 is an apocalyptic number.

621404127 is a deficient number, since it is larger than the sum of its proper divisors (276179625).

621404127 is a wasteful number, since it uses less digits than its factorization.

621404127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69044909 (or 69044906 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 621404127 is about 24927.9787989319. The cubic root of 621404127 is about 853.3451236198.

Subtracting 621404127 from its reverse (721404126), we obtain a palindrome (99999999).

The spelling of 621404127 in words is "six hundred twenty-one million, four hundred four thousand, one hundred twenty-seven".