1988887 has 2 divisors, whose sum is σ = 1988888. Its totient is φ = 1988886.

The previous prime is 1988851. The next prime is 1988891. The reversal of 1988887 is 7888891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1988887 - 2⁷ = 1988759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1988887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994443 + 994444.

It is an arithmetic number, because the mean of its divisors is an integer number (994444).

2^1988887 is an apocalyptic number.

1988887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988887 is an equidigital number, since it uses as much as digits as its factorization.

1988887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 49.

The square root of 1988887 is about 1410.2790504010. The cubic root of 1988887 is about 125.7583130546.

The spelling of 1988887 in words is "one million, nine hundred eighty-eight thousand, eight hundred eighty-seven".