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9997987 is a prime number
BaseRepresentation
bin100110001000…
…111010100011
3200210221122211
4212020322203
510024413422
6554142551
7150660436
oct46107243
920727584
109997987
1157096aa
123421a57
1320c098c
14148381d
15d27577
hex988ea3

9997987 has 2 divisors, whose sum is σ = 9997988. Its totient is φ = 9997986.

The previous prime is 9997969. The next prime is 9997991. The reversal of 9997987 is 7897999.

It is a strong prime.

It is an emirp because it is prime and its reverse (7897999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9997987 - 27 = 9997859 is a prime.

It is not a weakly prime, because it can be changed into another prime (9997927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998993 + 4998994.

It is an arithmetic number, because the mean of its divisors is an integer number (4998994).

Almost surely, 29997987 is an apocalyptic number.

9997987 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997987 is an equidigital number, since it uses as much as digits as its factorization.

9997987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 58.

The square root of 9997987 is about 3161.9593609027. The cubic root of 9997987 is about 215.4290117763.

The spelling of 9997987 in words is "nine million, nine hundred ninety-seven thousand, nine hundred eighty-seven".