621890939 has 2 divisors, whose sum is σ = 621890940. Its totient is φ = 621890938.

The previous prime is 621890921. The next prime is 621890963. The reversal of 621890939 is 939098126.

621890939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621890939 - 2⁸ = 621890683 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 621890893 and 621890902.

It is not a weakly prime, because it can be changed into another prime (621890999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310945469 + 310945470.

It is an arithmetic number, because the mean of its divisors is an integer number (310945470).

Almost surely, 2^621890939 is an apocalyptic number.

621890939 is a deficient number, since it is larger than the sum of its proper divisors (1).

621890939 is an equidigital number, since it uses as much as digits as its factorization.

621890939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 621890939 is about 24937.7412569783. The cubic root of 621890939 is about 853.5679041448.

The spelling of 621890939 in words is "six hundred twenty-one million, eight hundred ninety thousand, nine hundred thirty-nine".