19995959 has 2 divisors, whose sum is σ = 19995960. Its totient is φ = 19995958.

The previous prime is 19995953. The next prime is 19995967. The reversal of 19995959 is 95959991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19995959 - 2¹² = 19991863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19995953) 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 as a sum of consecutive naturals, namely, 9997979 + 9997980.

It is an arithmetic number, because the mean of its divisors is an integer number (9997980).

Almost surely, 2^19995959 is an apocalyptic number.

19995959 is a deficient number, since it is larger than the sum of its proper divisors (1).

19995959 is an equidigital number, since it uses as much as digits as its factorization.

19995959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1476225, while the sum is 56.

The square root of 19995959 is about 4471.6841346410. The cubic root of 19995959 is about 271.4234788254.

The spelling of 19995959 in words is "nineteen million, nine hundred ninety-five thousand, nine hundred fifty-nine".