129306746 has 4 divisors (see below), whose sum is σ = 193960122. Its totient is φ = 64653372.

The previous prime is 129306739. The next prime is 129306757. The reversal of 129306746 is 647603921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 647603921 = 179 ⋅3617899.

It can be written as a sum of positive squares in only one way, i.e., 99221521 + 30085225 = 9961^2 + 5485^2 .

It is a super-2 number, since 2×129306746² = 33440469122217032, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32326685 + ... + 32326688.

Almost surely, 2^129306746 is an apocalyptic number.

129306746 is a deficient number, since it is larger than the sum of its proper divisors (64653376).

129306746 is an equidigital number, since it uses as much as digits as its factorization.

129306746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64653375.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 129306746 is about 11371.3124132617. The cubic root of 129306746 is about 505.6776133864.

The spelling of 129306746 in words is "one hundred twenty-nine million, three hundred six thousand, seven hundred forty-six".