129987854 has 16 divisors (see below), whose sum is σ = 207242880. Its totient is φ = 60973560.

The previous prime is 129987829. The next prime is 129987859. The reversal of 129987854 is 458789921.

It is a junction number, because it is equal to n+sod(n) for n = 129987796 and 129987805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129987859) 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, 12692 + ... + 20519.

It is an arithmetic number, because the mean of its divisors is an integer number (12952680).

Almost surely, 2^129987854 is an apocalyptic number.

129987854 is a deficient number, since it is larger than the sum of its proper divisors (77255026).

129987854 is a wasteful number, since it uses less digits than its factorization.

129987854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33335.

The product of its digits is 1451520, while the sum is 53.

The square root of 129987854 is about 11401.2216012145. The cubic root of 129987854 is about 506.5639247083.

The spelling of 129987854 in words is "one hundred twenty-nine million, nine hundred eighty-seven thousand, eight hundred fifty-four".