129478738 has 8 divisors (see below), whose sum is σ = 198955260. Its totient is φ = 63160320.

The previous prime is 129478733. The next prime is 129478759. The reversal of 129478738 is 837874921.

It can be written as a sum of positive squares in 2 ways, for example, as 80156209 + 49322529 = 8953^2 + 7023^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 129478691 and 129478700.

It is not an unprimeable number, because it can be changed into a prime (129478733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789423 + ... + 789586.

Almost surely, 2^129478738 is an apocalyptic number.

129478738 is a deficient number, since it is larger than the sum of its proper divisors (69476522).

129478738 is a wasteful number, since it uses less digits than its factorization.

129478738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579052.

The product of its digits is 677376, while the sum is 49.

The square root of 129478738 is about 11378.8724397455. The cubic root of 129478738 is about 505.9017160835.

The spelling of 129478738 in words is "one hundred twenty-nine million, four hundred seventy-eight thousand, seven hundred thirty-eight".