129878001 has 12 divisors (see below), whose sum is σ = 204656400. Its totient is φ = 78713880.

The previous prime is 129877949. The next prime is 129878009. The reversal of 129878001 is 100878921.

It is not a de Polignac number, because 129878001 - 2¹⁴ = 129861617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129878009) 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 11 ways as a sum of consecutive naturals, for example, 655851 + ... + 656048.

It is an arithmetic number, because the mean of its divisors is an integer number (17054700).

Almost surely, 2^129878001 is an apocalyptic number.

129878001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129878001 is a deficient number, since it is larger than the sum of its proper divisors (74778399).

129878001 is a wasteful number, since it uses less digits than its factorization.

129878001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311916 (or 1311913 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 129878001 is about 11396.4029851528. The cubic root of 129878001 is about 506.4211850896.

The spelling of 129878001 in words is "one hundred twenty-nine million, eight hundred seventy-eight thousand, one".