129242426 has 4 divisors (see below), whose sum is σ = 193863642. Its totient is φ = 64621212.

The previous prime is 129242419. The next prime is 129242431. The reversal of 129242426 is 624242921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 127667401 + 1575025 = 11299^2 + 1255^2 .

It is a junction number, because it is equal to n+sod(n) for n = 129242392 and 129242401.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32310605 + ... + 32310608.

Almost surely, 2^129242426 is an apocalyptic number.

129242426 is a deficient number, since it is larger than the sum of its proper divisors (64621216).

129242426 is an equidigital number, since it uses as much as digits as its factorization.

129242426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64621215.

The product of its digits is 13824, while the sum is 32.

The square root of 129242426 is about 11368.4838918829. The cubic root of 129242426 is about 505.5937544502.

The spelling of 129242426 in words is "one hundred twenty-nine million, two hundred forty-two thousand, four hundred twenty-six".