129851424 has 72 divisors (see below), whose sum is σ = 382964400. Its totient is φ = 43281216.

The previous prime is 129851417. The next prime is 129851461. The reversal of 129851424 is 424158921.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×129851424² = 33722784629655552, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 574 + ... + 16125.

It is an arithmetic number, because the mean of its divisors is an integer number (5318950).

Almost surely, 2^129851424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129851424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191482200).

129851424 is an abundant number, since it is smaller than the sum of its proper divisors (253112976).

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

129851424 is an equidigital number, since it uses as much as digits as its factorization.

129851424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16724 (or 16704 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 129851424 is about 11395.2368996875. The cubic root of 129851424 is about 506.3866396601.

The spelling of 129851424 in words is "one hundred twenty-nine million, eight hundred fifty-one thousand, four hundred twenty-four".