129987143 has 16 divisors (see below), whose sum is σ = 153184416. Its totient is φ = 108743040.

The previous prime is 129987139. The next prime is 129987149. The reversal of 129987143 is 341789921.

It is a cyclic number.

It is not a de Polignac number, because 129987143 - 2² = 129987139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129987094 and 129987103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129987149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52121 + ... + 54557.

It is an arithmetic number, because the mean of its divisors is an integer number (9574026).

Almost surely, 2^129987143 is an apocalyptic number.

129987143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

129987143 is a deficient number, since it is larger than the sum of its proper divisors (23197273).

129987143 is a wasteful number, since it uses less digits than its factorization.

129987143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834.

The product of its digits is 108864, while the sum is 44.

The square root of 129987143 is about 11401.1904203026. The cubic root of 129987143 is about 506.5630011153.

The spelling of 129987143 in words is "one hundred twenty-nine million, nine hundred eighty-seven thousand, one hundred forty-three".