129723104 has 36 divisors (see below), whose sum is σ = 292261032. Its totient is φ = 55522560.

The previous prime is 129723091. The next prime is 129723109. The reversal of 129723104 is 401327921.

It is a super-2 number, since 2×129723104² = 33656167422789632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129723109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 170084 + ... + 170844.

It is an arithmetic number, because the mean of its divisors is an integer number (8118362).

Almost surely, 2^129723104 is an apocalyptic number.

129723104 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

129723104 is an abundant number, since it is smaller than the sum of its proper divisors (162537928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129723104 is an frugal number, since it uses more digits than its factorization.

129723104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 129723104 is about 11389.6050853399. The cubic root of 129723104 is about 506.2197798554.

The spelling of 129723104 in words is "one hundred twenty-nine million, seven hundred twenty-three thousand, one hundred four".