129443690 has 8 divisors (see below), whose sum is σ = 232998660. Its totient is φ = 51777472.

The previous prime is 129443689. The next prime is 129443719. The reversal of 129443690 is 96344921.

It can be written as a sum of positive squares in 2 ways, for example, as 128300929 + 1142761 = 11327^2 + 1069^2 .

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

It is a super-2 number, since 2×129443690² = 33511337761632200, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6472175 + ... + 6472194.

Almost surely, 2^129443690 is an apocalyptic number.

129443690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129443690 is a deficient number, since it is larger than the sum of its proper divisors (103554970).

129443690 is a wasteful number, since it uses less digits than its factorization.

129443690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12944376.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 129443690 is about 11377.3322883706. The cubic root of 129443690 is about 505.8560652333.

The spelling of 129443690 in words is "one hundred twenty-nine million, four hundred forty-three thousand, six hundred ninety".