129864381 has 8 divisors (see below), whose sum is σ = 173973984. Its totient is φ = 86165520.

The previous prime is 129864367. The next prime is 129864391. The reversal of 129864381 is 183468921.

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

It is not a de Polignac number, because 129864381 - 2¹⁴ = 129847997 is a prime.

It is a super-2 number, since 2×129864381² = 33729514905026322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129864311) 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, 101946 + ... + 103211.

It is an arithmetic number, because the mean of its divisors is an integer number (21746748).

Almost surely, 2^129864381 is an apocalyptic number.

It is an amenable number.

129864381 is a deficient number, since it is larger than the sum of its proper divisors (44109603).

129864381 is a wasteful number, since it uses less digits than its factorization.

129864381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205371.

The product of its digits is 82944, while the sum is 42.

The square root of 129864381 is about 11395.8054125191. The cubic root of 129864381 is about 506.4034820719.

It can be divided in two parts, 1298 and 64381, that multiplied together give a palindrome (83566538).

The spelling of 129864381 in words is "one hundred twenty-nine million, eight hundred sixty-four thousand, three hundred eighty-one".