129477643 has 4 divisors (see below), whose sum is σ = 130497280. Its totient is φ = 128458008.

The previous prime is 129477619. The next prime is 129477653. The reversal of 129477643 is 346774921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346774921 = 1831 ⋅189391.

It is a cyclic number.

It is not a de Polignac number, because 129477643 - 2⁵ = 129477611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129477643.

It is not an unprimeable number, because it can be changed into a prime (129477613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509628 + ... + 509881.

It is an arithmetic number, because the mean of its divisors is an integer number (32624320).

Almost surely, 2^129477643 is an apocalyptic number.

129477643 is a deficient number, since it is larger than the sum of its proper divisors (1019637).

129477643 is a wasteful number, since it uses less digits than its factorization.

129477643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019636.

The product of its digits is 254016, while the sum is 43.

The square root of 129477643 is about 11378.8243241558. The cubic root of 129477643 is about 505.9002899448.

The spelling of 129477643 in words is "one hundred twenty-nine million, four hundred seventy-seven thousand, six hundred forty-three".