129797900 has 18 divisors (see below), whose sum is σ = 281661660. Its totient is φ = 51919120.

The previous prime is 129797897. The next prime is 129797903. The reversal of 129797900 is 9797921.

It is an interprime number because it is at equal distance from previous prime (129797897) and next prime (129797903).

It is not an unprimeable number, because it can be changed into a prime (129797903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 648890 + ... + 649089.

It is an arithmetic number, because the mean of its divisors is an integer number (15647870).

Almost surely, 2^129797900 is an apocalyptic number.

129797900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129797900 is an abundant number, since it is smaller than the sum of its proper divisors (151863760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129797900 is a wasteful number, since it uses less digits than its factorization.

129797900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297993 (or 1297986 counting only the distinct ones).

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 129797900 is about 11392.8881325150. Note that the first 3 decimals coincide. The cubic root of 129797900 is about 506.3170535579.

The spelling of 129797900 in words is "one hundred twenty-nine million, seven hundred ninety-seven thousand, nine hundred".