129612987 has 36 divisors (see below), whose sum is σ = 224085240. Its totient is φ = 73827936.

The previous prime is 129612971. The next prime is 129613061. The reversal of 129612987 is 789216921.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

129612987 is a `hidden beast` number, since 1 + 29 + 612 + 9 + 8 + 7 = 666.

It is not a de Polignac number, because 129612987 - 2⁴ = 129612971 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (129612937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 413943 + ... + 414255.

It is an arithmetic number, because the mean of its divisors is an integer number (6224590).

Almost surely, 2^129612987 is an apocalyptic number.

129612987 is a deficient number, since it is larger than the sum of its proper divisors (94472253).

129612987 is an frugal number, since it uses more digits than its factorization.

129612987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649 (or 323 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 129612987 is about 11384.7699581502. The cubic root of 129612987 is about 506.0765024128.

The spelling of 129612987 in words is "one hundred twenty-nine million, six hundred twelve thousand, nine hundred eighty-seven".