129097420 has 24 divisors (see below), whose sum is σ = 273596400. Its totient is φ = 51164352.

The previous prime is 129097417. The next prime is 129097421. The reversal of 129097420 is 24790921.

It is a happy number.

It is a super-2 number, since 2×129097420² = 33332287701312800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129097421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27430 + ... + 31789.

It is an arithmetic number, because the mean of its divisors is an integer number (11399850).

Almost surely, 2^129097420 is an apocalyptic number.

129097420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129097420 is an abundant number, since it is smaller than the sum of its proper divisors (144498980).

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

129097420 is a wasteful number, since it uses less digits than its factorization.

129097420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59337 (or 59335 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 129097420 is about 11362.1045585754. The cubic root of 129097420 is about 505.4045968439.

The spelling of 129097420 in words is "one hundred twenty-nine million, ninety-seven thousand, four hundred twenty".