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1997887 is a prime number
BaseRepresentation
bin111100111110000111111
310202111120211
413213300333
51002413022
6110453251
722660513
oct7476077
93674524
101997887
111145051
12804227
1354c4a8
143a0143
15296e77
hex1e7c3f

1997887 has 2 divisors, whose sum is σ = 1997888. Its totient is φ = 1997886.

The previous prime is 1997867. The next prime is 1997899. The reversal of 1997887 is 7887991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1997887 is a prime.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1997887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998943 + 998944.

It is an arithmetic number, because the mean of its divisors is an integer number (998944).

21997887 is an apocalyptic number.

1997887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997887 is an equidigital number, since it uses as much as digits as its factorization.

1997887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 49.

The square root of 1997887 is about 1413.4663066377. The cubic root of 1997887 is about 125.9477191350.

The spelling of 1997887 in words is "one million, nine hundred ninety-seven thousand, eight hundred eighty-seven".