129999744 has 240 divisors, whose sum is σ = 445695120. Its totient is φ = 36352512.

The previous prime is 129999743. The next prime is 129999761. The reversal of 129999744 is 447999921.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129999743) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 2765929 + ... + 2765975.

It is an arithmetic number, because the mean of its divisors is an integer number (1857063).

Almost surely, 2^129999744 is an apocalyptic number.

129999744 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129999744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222847560).

129999744 is an abundant number, since it is smaller than the sum of its proper divisors (315695376).

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

129999744 is an frugal number, since it uses more digits than its factorization.

129999744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 59 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 129999744 is about 11401.7430246432. The cubic root of 129999744 is about 506.5793693858.

The spelling of 129999744 in words is "one hundred twenty-nine million, nine hundred ninety-nine thousand, seven hundred forty-four".