129649646 has 16 divisors (see below), whose sum is σ = 224226144. Its totient is φ = 55071744.

The previous prime is 129649579. The next prime is 129649649. The reversal of 129649646 is 646946921.

129649646 is nontrivially palindromic in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 129649646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129649649) 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, 39395 + ... + 42558.

It is an arithmetic number, because the mean of its divisors is an integer number (14014134).

Almost surely, 2^129649646 is an apocalyptic number.

129649646 is a deficient number, since it is larger than the sum of its proper divisors (94576498).

129649646 is a wasteful number, since it uses less digits than its factorization.

129649646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82075.

The product of its digits is 559872, while the sum is 47.

The square root of 129649646 is about 11386.3798461144. The cubic root of 129649646 is about 506.1242098484.

The spelling of 129649646 in words is "one hundred twenty-nine million, six hundred forty-nine thousand, six hundred forty-six".