19430639 has 2 divisors, whose sum is σ = 19430640. Its totient is φ = 19430638.

The previous prime is 19430611. The next prime is 19430657. The reversal of 19430639 is 93603491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19430639 - 2¹² = 19426543 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 19430599 and 19430608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19430039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9715319 + 9715320.

It is an arithmetic number, because the mean of its divisors is an integer number (9715320).

Almost surely, 2^19430639 is an apocalyptic number.

19430639 is a deficient number, since it is larger than the sum of its proper divisors (1).

19430639 is an equidigital number, since it uses as much as digits as its factorization.

19430639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 19430639 is about 4408.0198502275. The cubic root of 19430639 is about 268.8411189857.

The spelling of 19430639 in words is "nineteen million, four hundred thirty thousand, six hundred thirty-nine".