129340397 has 4 divisors (see below), whose sum is σ = 129895740. Its totient is φ = 128785056.

The previous prime is 129340357. The next prime is 129340427. The reversal of 129340397 is 793043921.

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 73599241 + 55741156 = 8579^2 + 7466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129340397 is a prime.

It is a super-2 number, since 2×129340397² = 33457876592235218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129340397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129340307) 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, 277322 + ... + 277787.

It is an arithmetic number, because the mean of its divisors is an integer number (32473935).

Almost surely, 2^129340397 is an apocalyptic number.

It is an amenable number.

129340397 is a deficient number, since it is larger than the sum of its proper divisors (555343).

129340397 is an equidigital number, since it uses as much as digits as its factorization.

129340397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555342.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 129340397 is about 11372.7919615194. The cubic root of 129340397 is about 505.7214757060.

The spelling of 129340397 in words is "one hundred twenty-nine million, three hundred forty thousand, three hundred ninety-seven".