129640546 has 8 divisors (see below), whose sum is σ = 222240960. Its totient is φ = 55560228.

The previous prime is 129640541. The next prime is 129640547. The reversal of 129640546 is 645046921.

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

It is not an unprimeable number, because it can be changed into a prime (129640541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4630006 + ... + 4630033.

It is an arithmetic number, because the mean of its divisors is an integer number (27780120).

Almost surely, 2^129640546 is an apocalyptic number.

129640546 is a deficient number, since it is larger than the sum of its proper divisors (92600414).

129640546 is an equidigital number, since it uses as much as digits as its factorization.

129640546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9260048.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 129640546 is about 11385.9802388727. The cubic root of 129640546 is about 506.1123680933.

The spelling of 129640546 in words is "one hundred twenty-nine million, six hundred forty thousand, five hundred forty-six".