129425739 has 8 divisors (see below), whose sum is σ = 181650240. Its totient is φ = 81742536.

The previous prime is 129425731. The next prime is 129425767. The reversal of 129425739 is 937524921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129425739 - 2³ = 129425731 is a prime.

It is a super-2 number, since 2×129425739² = 33502043831392242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129425739.

It is not an unprimeable number, because it can be changed into a prime (129425731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1135257 + ... + 1135370.

It is an arithmetic number, because the mean of its divisors is an integer number (22706280).

Almost surely, 2^129425739 is an apocalyptic number.

129425739 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

129425739 is a deficient number, since it is larger than the sum of its proper divisors (52224501).

129425739 is a wasteful number, since it uses less digits than its factorization.

129425739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270649.

The product of its digits is 136080, while the sum is 42.

The square root of 129425739 is about 11376.5433678249. The cubic root of 129425739 is about 505.8326804395.

It can be divided in two parts, 12942 and 5739, that added together give a palindrome (18681).

The spelling of 129425739 in words is "one hundred twenty-nine million, four hundred twenty-five thousand, seven hundred thirty-nine".