129789646 has 32 divisors (see below), whose sum is σ = 236574720. Its totient is φ = 52164000.

The previous prime is 129789619. The next prime is 129789659. The reversal of 129789646 is 646987921.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 129789593 and 129789602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24451 + ... + 29281.

It is an arithmetic number, because the mean of its divisors is an integer number (7392960).

Almost surely, 2^129789646 is an apocalyptic number.

129789646 is a deficient number, since it is larger than the sum of its proper divisors (106785074).

129789646 is a wasteful number, since it uses less digits than its factorization.

129789646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4960.

The product of its digits is 1306368, while the sum is 52.

The square root of 129789646 is about 11392.5258832271. The cubic root of 129789646 is about 506.3063208996.

The spelling of 129789646 in words is "one hundred twenty-nine million, seven hundred eighty-nine thousand, six hundred forty-six".