129743830 has 32 divisors (see below), whose sum is σ = 253971936. Its totient is φ = 47522304.

The previous prime is 129743827. The next prime is 129743839. The reversal of 129743830 is 38347921.

It is a super-2 number, since 2×129743830² = 33666922846137800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 129743830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129743839) 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, 4024 + ... + 16603.

It is an arithmetic number, because the mean of its divisors is an integer number (7936623).

Almost surely, 2^129743830 is an apocalyptic number.

129743830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129743830 is a deficient number, since it is larger than the sum of its proper divisors (124228106).

129743830 is a wasteful number, since it uses less digits than its factorization.

129743830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20688.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 129743830 is about 11390.5149137341. The cubic root of 129743830 is about 506.2467381795.

The spelling of 129743830 in words is "one hundred twenty-nine million, seven hundred forty-three thousand, eight hundred thirty".