129869144 has 16 divisors (see below), whose sum is σ = 245058000. Its totient is φ = 64520352.

The previous prime is 129869111. The next prime is 129869177. The reversal of 129869144 is 441968921.

It is an interprime number because it is at equal distance from previous prime (129869111) and next prime (129869177).

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 129869095 and 129869104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50444 + ... + 52955.

It is an arithmetic number, because the mean of its divisors is an integer number (15316125).

Almost surely, 2^129869144 is an apocalyptic number.

It is an amenable number.

129869144 is a deficient number, since it is larger than the sum of its proper divisors (115188856).

129869144 is a wasteful number, since it uses less digits than its factorization.

129869144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103562 (or 103558 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 129869144 is about 11396.0143910053. The cubic root of 129869144 is about 506.4096730697.

The spelling of 129869144 in words is "one hundred twenty-nine million, eight hundred sixty-nine thousand, one hundred forty-four".