129887639 has 8 divisors (see below), whose sum is σ = 148545408. Its totient is φ = 111255480.

The previous prime is 129887603. The next prime is 129887651. The reversal of 129887639 is 936788921.

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

It is not a de Polignac number, because 129887639 - 2⁸ = 129887383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129887689) 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, 6104 + ... + 17234.

It is an arithmetic number, because the mean of its divisors is an integer number (18568176).

Almost surely, 2^129887639 is an apocalyptic number.

129887639 is a deficient number, since it is larger than the sum of its proper divisors (18657769).

129887639 is a wasteful number, since it uses less digits than its factorization.

129887639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12805.

The product of its digits is 1306368, while the sum is 53.

The square root of 129887639 is about 11396.8258300283. The cubic root of 129887639 is about 506.4337116315.

The spelling of 129887639 in words is "one hundred twenty-nine million, eight hundred eighty-seven thousand, six hundred thirty-nine".