619987 has 2 divisors, whose sum is σ = 619988. Its totient is φ = 619986.

The previous prime is 619981. The next prime is 619999. The reversal of 619987 is 789916.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 619987 - 2³ = 619979 is a prime.

It is not a weakly prime, because it can be changed into another prime (619981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309993 + 309994.

It is an arithmetic number, because the mean of its divisors is an integer number (309994).

2⁶¹⁹⁹⁸⁷ is an apocalyptic number.

619987 is a deficient number, since it is larger than the sum of its proper divisors (1).

619987 is an equidigital number, since it uses as much as digits as its factorization.

619987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 40.

The square root of 619987 is about 787.3925323497. The cubic root of 619987 is about 85.2695938542.

The spelling of 619987 in words is "six hundred nineteen thousand, nine hundred eighty-seven".