19442987 has 2 divisors, whose sum is σ = 19442988. Its totient is φ = 19442986.

The previous prime is 19442977. The next prime is 19442993. The reversal of 19442987 is 78924491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19442987 - 2¹⁰ = 19441963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19442977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9721493 + 9721494.

It is an arithmetic number, because the mean of its divisors is an integer number (9721494).

Almost surely, 2^19442987 is an apocalyptic number.

19442987 is a deficient number, since it is larger than the sum of its proper divisors (1).

19442987 is an equidigital number, since it uses as much as digits as its factorization.

19442987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 19442987 is about 4409.4202566777. The cubic root of 19442987 is about 268.8980556478.

The spelling of 19442987 in words is "nineteen million, four hundred forty-two thousand, nine hundred eighty-seven".