129265436 has 18 divisors (see below), whose sum is σ = 238749840. Its totient is φ = 61230312.

The previous prime is 129265421. The next prime is 129265453. The reversal of 129265436 is 634562921.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a self number, because there is not a number n which added to its sum of digits gives 129265436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43316 + ... + 46203.

It is an arithmetic number, because the mean of its divisors is an integer number (13263880).

Almost surely, 2^129265436 is an apocalyptic number.

It is an amenable number.

129265436 is a deficient number, since it is larger than the sum of its proper divisors (109484404).

129265436 is a wasteful number, since it uses less digits than its factorization.

129265436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89561 (or 89540 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 129265436 is about 11369.4958551380. The cubic root of 129265436 is about 505.6237575545.

The spelling of 129265436 in words is "one hundred twenty-nine million, two hundred sixty-five thousand, four hundred thirty-six".