129366836 has 6 divisors (see below), whose sum is σ = 226391970. Its totient is φ = 64683416.

The previous prime is 129366827. The next prime is 129366841. The reversal of 129366836 is 638663921.

It can be written as a sum of positive squares in only one way, i.e., 126787600 + 2579236 = 11260^2 + 1606^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16170851 + ... + 16170858.

It is an arithmetic number, because the mean of its divisors is an integer number (37731995).

Almost surely, 2^129366836 is an apocalyptic number.

It is an amenable number.

129366836 is a deficient number, since it is larger than the sum of its proper divisors (97025134).

129366836 is a wasteful number, since it uses less digits than its factorization.

129366836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32341713 (or 32341711 counting only the distinct ones).

The product of its digits is 279936, while the sum is 44.

The square root of 129366836 is about 11373.9542816032. The cubic root of 129366836 is about 505.7559322240.

The spelling of 129366836 in words is "one hundred twenty-nine million, three hundred sixty-six thousand, eight hundred thirty-six".