129030381 has 16 divisors (see below), whose sum is σ = 191565120. Its totient is φ = 85836240.

The previous prime is 129030373. The next prime is 129030397. The reversal of 129030381 is 183030921.

It is not a de Polignac number, because 129030381 - 2³ = 129030373 is a prime.

It is a super-2 number, since 2×129030381² = 33297678442010322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129030371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8391 + ... + 18123.

It is an arithmetic number, because the mean of its divisors is an integer number (11972820).

Almost surely, 2^129030381 is an apocalyptic number.

It is an amenable number.

129030381 is a deficient number, since it is larger than the sum of its proper divisors (62534739).

129030381 is an equidigital number, since it uses as much as digits as its factorization.

129030381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10233 (or 10227 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 129030381 is about 11359.1540618129. The cubic root of 129030381 is about 505.3170978444.

The spelling of 129030381 in words is "one hundred twenty-nine million, thirty thousand, three hundred eighty-one".