621432439 has 2 divisors, whose sum is σ = 621432440. Its totient is φ = 621432438.

The previous prime is 621432421. The next prime is 621432457. The reversal of 621432439 is 934234126.

It is a happy number.

621432439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (621432421) and next prime (621432457).

It is a cyclic number.

It is not a de Polignac number, because 621432439 - 2¹¹ = 621430391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621432499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310716219 + 310716220.

It is an arithmetic number, because the mean of its divisors is an integer number (310716220).

Almost surely, 2^621432439 is an apocalyptic number.

621432439 is a deficient number, since it is larger than the sum of its proper divisors (1).

621432439 is an equidigital number, since it uses as much as digits as its factorization.

621432439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 34.

The square root of 621432439 is about 24928.5466684281. The cubic root of 621432439 is about 853.3580832699.

The spelling of 621432439 in words is "six hundred twenty-one million, four hundred thirty-two thousand, four hundred thirty-nine".