993920639 has 2 divisors, whose sum is σ = 993920640. Its totient is φ = 993920638.

The previous prime is 993920633. The next prime is 993920651. The reversal of 993920639 is 936029399.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 993920639 - 2¹⁶ = 993855103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993920633) 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 as a sum of consecutive naturals, namely, 496960319 + 496960320.

It is an arithmetic number, because the mean of its divisors is an integer number (496960320).

Almost surely, 2^993920639 is an apocalyptic number.

993920639 is a deficient number, since it is larger than the sum of its proper divisors (1).

993920639 is an equidigital number, since it uses as much as digits as its factorization.

993920639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 708588, while the sum is 50.

The square root of 993920639 is about 31526.5069267117. The cubic root of 993920639 is about 997.9694258930.

The spelling of 993920639 in words is "nine hundred ninety-three million, nine hundred twenty thousand, six hundred thirty-nine".