129789754 has 4 divisors (see below), whose sum is σ = 194684634. Its totient is φ = 64894876.

The previous prime is 129789749. The next prime is 129789763. The reversal of 129789754 is 457987921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 457987921 = 131 ⋅3496091.

It can be written as a sum of positive squares in only one way, i.e., 126045529 + 3744225 = 11227^2 + 1935^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32447437 + ... + 32447440.

Almost surely, 2^129789754 is an apocalyptic number.

129789754 is a deficient number, since it is larger than the sum of its proper divisors (64894880).

129789754 is an equidigital number, since it uses as much as digits as its factorization.

129789754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64894879.

The product of its digits is 1270080, while the sum is 52.

The square root of 129789754 is about 11392.5306231759. The cubic root of 129789754 is about 506.3064613347.

The spelling of 129789754 in words is "one hundred twenty-nine million, seven hundred eighty-nine thousand, seven hundred fifty-four".