129478507397 has 4 divisors (see below), whose sum is σ = 132489635520. Its totient is φ = 126467379276.

The previous prime is 129478507369. The next prime is 129478507439. The reversal of 129478507397 is 793705874921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129478507397 - 2¹⁴ = 129478491013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129478507597) 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, 1505563997 + ... + 1505564082.

It is an arithmetic number, because the mean of its divisors is an integer number (33122408880).

Almost surely, 2^129478507397 is an apocalyptic number.

It is an amenable number.

129478507397 is a deficient number, since it is larger than the sum of its proper divisors (3011128123).

129478507397 is an equidigital number, since it uses as much as digits as its factorization.

129478507397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3011128122.

The product of its (nonzero) digits is 26671680, while the sum is 62.

The spelling of 129478507397 in words is "one hundred twenty-nine billion, four hundred seventy-eight million, five hundred seven thousand, three hundred ninety-seven".