129797530 has 16 divisors (see below), whose sum is σ = 238044744. Its totient is φ = 50939200.

The previous prime is 129797519. The next prime is 129797557. The reversal of 129797530 is 35797921.

It can be written as a sum of positive squares in 4 ways, for example, as 90497169 + 39300361 = 9513^2 + 6269^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121921 + ... + 122980.

Almost surely, 2^129797530 is an apocalyptic number.

129797530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129797530 is a deficient number, since it is larger than the sum of its proper divisors (108247214).

129797530 is a wasteful number, since it uses less digits than its factorization.

129797530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244961.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 129797530 is about 11392.8718943030. The cubic root of 129797530 is about 506.3165724575.

The spelling of 129797530 in words is "one hundred twenty-nine million, seven hundred ninety-seven thousand, five hundred thirty".