19739959 has 2 divisors, whose sum is σ = 19739960. Its totient is φ = 19739958.

The previous prime is 19739939. The next prime is 19739977. The reversal of 19739959 is 95993791.

It is a strong prime.

It is an emirp because it is prime and its reverse (95993791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19739959 - 2⁵ = 19739927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19739939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9869979 + 9869980.

It is an arithmetic number, because the mean of its divisors is an integer number (9869980).

Almost surely, 2^19739959 is an apocalyptic number.

19739959 is a deficient number, since it is larger than the sum of its proper divisors (1).

19739959 is an equidigital number, since it uses as much as digits as its factorization.

19739959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 688905, while the sum is 52.

The square root of 19739959 is about 4442.9673642736. The cubic root of 19739959 is about 270.2601927078.

The spelling of 19739959 in words is "nineteen million, seven hundred thirty-nine thousand, nine hundred fifty-nine".