129379397 has 8 divisors (see below), whose sum is σ = 148012800. Its totient is φ = 110783664.

The previous prime is 129379387. The next prime is 129379423. The reversal of 129379397 is 793973921.

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

It is a cyclic number.

It is not a de Polignac number, because 129379397 - 2¹⁸ = 129117253 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 (129379387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1622 + ... + 16167.

It is an arithmetic number, because the mean of its divisors is an integer number (18501600).

Almost surely, 2^129379397 is an apocalyptic number.

It is an amenable number.

129379397 is a deficient number, since it is larger than the sum of its proper divisors (18633403).

129379397 is a wasteful number, since it uses less digits than its factorization.

129379397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18835.

The product of its digits is 642978, while the sum is 50.

The square root of 129379397 is about 11374.5064508312. The cubic root of 129379397 is about 505.7723006505.

The spelling of 129379397 in words is "one hundred twenty-nine million, three hundred seventy-nine thousand, three hundred ninety-seven".