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129987 = 321113101
BaseRepresentation
bin11111101111000011
320121022100
4133233003
513124422
62441443
71050654
oct375703
9217270
10129987
1189730
1263283
1347220
143552b
15287ac
hex1fbc3

129987 has 24 divisors (see below), whose sum is σ = 222768. Its totient is φ = 72000.

The previous prime is 129971. The next prime is 130003. The reversal of 129987 is 789921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129971) and next prime (130003).

It is not a de Polignac number, because 129987 - 24 = 129971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1237 + ... + 1337.

It is an arithmetic number, because the mean of its divisors is an integer number (9282).

2129987 is an apocalyptic number.

129987 is a deficient number, since it is larger than the sum of its proper divisors (92781).

129987 is a wasteful number, since it uses less digits than its factorization.

129987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 128 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 129987 is about 360.5370993393. The cubic root of 129987 is about 50.6562815357.

It can be divided in two parts, 12 and 9987, that added together give a palindrome (9999).

The spelling of 129987 in words is "one hundred twenty-nine thousand, nine hundred eighty-seven".

Divisors: 1 3 9 11 13 33 39 99 101 117 143 303 429 909 1111 1287 1313 3333 3939 9999 11817 14443 43329 129987