129478707 has 24 divisors (see below), whose sum is σ = 201895200. Its totient is φ = 79715328.

The previous prime is 129478703. The next prime is 129478717. The reversal of 129478707 is 707874921.

It is a happy number.

It is not a de Polignac number, because 129478707 - 2² = 129478703 is a prime.

It is a super-4 number, since 4×129478707⁴ (a number of 34 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (129478703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4782 + ... + 16787.

It is an arithmetic number, because the mean of its divisors is an integer number (8412300).

Almost surely, 2^129478707 is an apocalyptic number.

129478707 is a deficient number, since it is larger than the sum of its proper divisors (72416493).

129478707 is a wasteful number, since it uses less digits than its factorization.

129478707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21627 (or 21624 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The square root of 129478707 is about 11378.8710775718. The cubic root of 129478707 is about 505.9016757089.

The spelling of 129478707 in words is "one hundred twenty-nine million, four hundred seventy-eight thousand, seven hundred seven".