129975645 has 32 divisors (see below), whose sum is σ = 220280832. Its totient is φ = 65305152.

The previous prime is 129975623. The next prime is 129975649. The reversal of 129975645 is 546579921.

It is not a de Polignac number, because 129975645 - 2⁵ = 129975613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129975594 and 129975603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129975649) 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, 20304 + ... + 25926.

It is an arithmetic number, because the mean of its divisors is an integer number (6883776).

Almost surely, 2^129975645 is an apocalyptic number.

129975645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129975645 is a deficient number, since it is larger than the sum of its proper divisors (90305187).

129975645 is a wasteful number, since it uses less digits than its factorization.

129975645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5721.

The product of its digits is 680400, while the sum is 48.

The square root of 129975645 is about 11400.6861635605. The cubic root of 129975645 is about 506.5480646814.

The spelling of 129975645 in words is "one hundred twenty-nine million, nine hundred seventy-five thousand, six hundred forty-five".