129720423 has 32 divisors (see below), whose sum is σ = 203341824. Its totient is φ = 72022752.

The previous prime is 129720413. The next prime is 129720427. The reversal of 129720423 is 324027921.

It is not a de Polignac number, because 129720423 - 2⁴ = 129720407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129720427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164436 + ... + 165222.

It is an arithmetic number, because the mean of its divisors is an integer number (6354432).

Almost surely, 2^129720423 is an apocalyptic number.

129720423 is a deficient number, since it is larger than the sum of its proper divisors (73621401).

129720423 is a wasteful number, since it uses less digits than its factorization.

129720423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 129720423 is about 11389.4873896941. The cubic root of 129720423 is about 506.2162924669.

The spelling of 129720423 in words is "one hundred twenty-nine million, seven hundred twenty thousand, four hundred twenty-three".