129275390 has 32 divisors (see below), whose sum is σ = 236242656. Its totient is φ = 50928640.

The previous prime is 129275389. The next prime is 129275413. The reversal of 129275390 is 93572921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263045 + ... + 263535.

It is an arithmetic number, because the mean of its divisors is an integer number (7382583).

Almost surely, 2^129275390 is an apocalyptic number.

129275390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129275390 is a deficient number, since it is larger than the sum of its proper divisors (106967266).

129275390 is a wasteful number, since it uses less digits than its factorization.

129275390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 129275390 is about 11369.9335969917. The cubic root of 129275390 is about 505.6367356298.

The spelling of 129275390 in words is "one hundred twenty-nine million, two hundred seventy-five thousand, three hundred ninety".