129866139 has 32 divisors (see below), whose sum is σ = 210739200. Its totient is φ = 78550560.

The previous prime is 129866137. The next prime is 129866141. The reversal of 129866139 is 931668921.

It is a happy number.

129866139 is a `hidden beast` number, since 1 + 29 + 8 + 6 + 613 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (129866137) and next prime (129866141).

It is not a de Polignac number, because 129866139 - 2¹ = 129866137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129866094 and 129866103.

It is not an unprimeable number, because it can be changed into a prime (129866131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17574 + ... + 23844.

It is an arithmetic number, because the mean of its divisors is an integer number (6585600).

Almost surely, 2^129866139 is an apocalyptic number.

129866139 is a deficient number, since it is larger than the sum of its proper divisors (80873061).

129866139 is a wasteful number, since it uses less digits than its factorization.

129866139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6352 (or 6346 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 129866139 is about 11395.8825459023. The cubic root of 129866139 is about 506.4057671565.

The spelling of 129866139 in words is "one hundred twenty-nine million, eight hundred sixty-six thousand, one hundred thirty-nine".