129039040397 has 4 divisors (see below), whose sum is σ = 129039838560. Its totient is φ = 129038242236.

The previous prime is 129039040393. The next prime is 129039040399. The reversal of 129039040397 is 793040930921.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 793040930921 = 43 ⋅18442812347.

It is a cyclic number.

It is not a de Polignac number, because 129039040397 - 2² = 129039040393 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 (129039040391) 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, 61247 + ... + 511692.

It is an arithmetic number, because the mean of its divisors is an integer number (32259959640).

Almost surely, 2^129039040397 is an apocalyptic number.

It is an amenable number.

129039040397 is a deficient number, since it is larger than the sum of its proper divisors (798163).

129039040397 is an equidigital number, since it uses as much as digits as its factorization.

129039040397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798162.

The product of its (nonzero) digits is 367416, while the sum is 47.

The spelling of 129039040397 in words is "one hundred twenty-nine billion, thirty-nine million, forty thousand, three hundred ninety-seven".