129384981 has 24 divisors (see below), whose sum is σ = 206683776. Its totient is φ = 77336640.

The previous prime is 129384949. The next prime is 129385001. The reversal of 129384981 is 189483921.

129384981 is a `hidden beast` number, since 129 + 38 + 498 + 1 = 666.

It is not a de Polignac number, because 129384981 - 2⁵ = 129384949 is a prime.

It is a super-2 number, since 2×129384981² = 33480946616740722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129384911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1725 + ... + 16178.

It is an arithmetic number, because the mean of its divisors is an integer number (8611824).

Almost surely, 2^129384981 is an apocalyptic number.

129384981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129384981 is a deficient number, since it is larger than the sum of its proper divisors (77298795).

129384981 is a wasteful number, since it uses less digits than its factorization.

129384981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17993 (or 17990 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 129384981 is about 11374.7519093825. The cubic root of 129384981 is about 505.7795769041.

The spelling of 129384981 in words is "one hundred twenty-nine million, three hundred eighty-four thousand, nine hundred eighty-one".