129401012 has 12 divisors (see below), whose sum is σ = 243871236. Its totient is φ = 59723520.

The previous prime is 129401009. The next prime is 129401029. The reversal of 129401012 is 210104921.

It can be written as a sum of positive squares in 2 ways, for example, as 45751696 + 83649316 = 6764^2 + 9146^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1244189 + ... + 1244292.

It is an arithmetic number, because the mean of its divisors is an integer number (20322603).

Almost surely, 2^129401012 is an apocalyptic number.

It is an amenable number.

129401012 is a deficient number, since it is larger than the sum of its proper divisors (114470224).

129401012 is a wasteful number, since it uses less digits than its factorization.

129401012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488498 (or 2488496 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 129401012 is about 11375.4565622660. The cubic root of 129401012 is about 505.8004649997.

Adding to 129401012 its reverse (210104921), we get a palindrome (339505933).

The spelling of 129401012 in words is "one hundred twenty-nine million, four hundred one thousand, twelve".