120019987 has 2 divisors, whose sum is σ = 120019988. Its totient is φ = 120019986.

The previous prime is 120019969. The next prime is 120020011. The reversal of 120019987 is 789910021.

It is a weak prime.

It is an emirp because it is prime and its reverse (789910021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120019987 - 2⁷ = 120019859 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (120019927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60009993 + 60009994.

It is an arithmetic number, because the mean of its divisors is an integer number (60009994).

Almost surely, 2^120019987 is an apocalyptic number.

120019987 is a deficient number, since it is larger than the sum of its proper divisors (1).

120019987 is an equidigital number, since it uses as much as digits as its factorization.

120019987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 120019987 is about 10955.3633896827. The cubic root of 120019987 is about 493.2697978907.

The spelling of 120019987 in words is "one hundred twenty million, nineteen thousand, nine hundred eighty-seven".