129997725 has 192 divisors, whose sum is σ = 287981568. Its totient is φ = 50688000.

The previous prime is 129997697. The next prime is 129997741. The reversal of 129997725 is 527799921.

It is not a de Polignac number, because 129997725 - 2¹³ = 129989533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

Its product of digits (714420) is a multiple of the sum of its prime factors (108).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4193460 + ... + 4193490.

It is an arithmetic number, because the mean of its divisors is an integer number (1499904).

Almost surely, 2^129997725 is an apocalyptic number.

129997725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129997725 is an abundant number, since it is smaller than the sum of its proper divisors (157983843).

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

129997725 is a wasteful number, since it uses less digits than its factorization.

129997725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 103 counting only the distinct ones).

The product of its digits is 714420, while the sum is 51.

The square root of 129997725 is about 11401.6544852052. The cubic root of 129997725 is about 506.5767468446.

The spelling of 129997725 in words is "one hundred twenty-nine million, nine hundred ninety-seven thousand, seven hundred twenty-five".