129424237 has 4 divisors (see below), whose sum is σ = 129523680. Its totient is φ = 129324796.

The previous prime is 129424223. The next prime is 129424271. The reversal of 129424237 is 732424921.

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 an emirpimes, since its reverse is a distinct semiprime: 732424921 = 197 ⋅3717893.

It is a cyclic number.

It is not a de Polignac number, because 129424237 - 2¹⁵ = 129391469 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129494237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47743 + ... + 50380.

It is an arithmetic number, because the mean of its divisors is an integer number (32380920).

Almost surely, 2^129424237 is an apocalyptic number.

It is an amenable number.

129424237 is a deficient number, since it is larger than the sum of its proper divisors (99443).

129424237 is an equidigital number, since it uses as much as digits as its factorization.

129424237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99442.

The product of its digits is 24192, while the sum is 34.

The square root of 129424237 is about 11376.4773546120. The cubic root of 129424237 is about 505.8307236839.

It can be divided in two parts, 12 and 9424237, that added together give a palindrome (9424249).

The spelling of 129424237 in words is "one hundred twenty-nine million, four hundred twenty-four thousand, two hundred thirty-seven".