129870145 has 8 divisors (see below), whose sum is σ = 156337704. Its totient is φ = 103567104.

The previous prime is 129870133. The next prime is 129870173. The reversal of 129870145 is 541078921.

129870145 = T₇₂₀₅ + T₇₂₀₆ + ... + T₇₂₀₉.

It can be written as a sum of positive squares in 4 ways, for example, as 5948721 + 123921424 = 2439^2 + 11132^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129870145 - 2¹⁵ = 129837377 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a plaindrome in base 14.

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, 39384 + ... + 42553.

It is an arithmetic number, because the mean of its divisors is an integer number (19542213).

Almost surely, 2^129870145 is an apocalyptic number.

It is an amenable number.

129870145 is a deficient number, since it is larger than the sum of its proper divisors (26467559).

129870145 is an equidigital number, since it uses as much as digits as its factorization.

129870145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82259.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 129870145 is about 11396.0583097841. The cubic root of 129870145 is about 506.4109741609.

The spelling of 129870145 in words is "one hundred twenty-nine million, eight hundred seventy thousand, one hundred forty-five".