129469745 has 4 divisors (see below), whose sum is σ = 155363700. Its totient is φ = 103575792.

The previous prime is 129469729. The next prime is 129469757. The reversal of 129469745 is 547964921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24960016 + 104509729 = 4996^2 + 10223^2 .

It is a cyclic number.

It is not a de Polignac number, because 129469745 - 2⁴ = 129469729 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 129469745.

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, 12946970 + ... + 12946979.

It is an arithmetic number, because the mean of its divisors is an integer number (38840925).

Almost surely, 2^129469745 is an apocalyptic number.

It is an amenable number.

129469745 is a deficient number, since it is larger than the sum of its proper divisors (25893955).

129469745 is an equidigital number, since it uses as much as digits as its factorization.

129469745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25893954.

The product of its digits is 544320, while the sum is 47.

The square root of 129469745 is about 11378.4772707072. The cubic root of 129469745 is about 505.8900032738.

The spelling of 129469745 in words is "one hundred twenty-nine million, four hundred sixty-nine thousand, seven hundred forty-five".