129975948 has 48 divisors (see below), whose sum is σ = 356801760. Its totient is φ = 40776192.

The previous prime is 129975943. The next prime is 129975959. The reversal of 129975948 is 849579921.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 129975894 and 129975903.

It is not an unprimeable number, because it can be changed into a prime (129975943) 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, 33561 + ... + 37232.

It is an arithmetic number, because the mean of its divisors is an integer number (7433370).

Almost surely, 2^129975948 is an apocalyptic number.

129975948 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

129975948 is an abundant number, since it is smaller than the sum of its proper divisors (226825812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129975948 is a wasteful number, since it uses less digits than its factorization.

129975948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70823 (or 70815 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 129975948 is about 11400.6994522266. The cubic root of 129975948 is about 506.5484583037.

The spelling of 129975948 in words is "one hundred twenty-nine million, nine hundred seventy-five thousand, nine hundred forty-eight".