129390242 has 4 divisors (see below), whose sum is σ = 194085366. Its totient is φ = 64695120.

The previous prime is 129390197. The next prime is 129390251. The reversal of 129390242 is 242093921.

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., 129299641 + 90601 = 11371^2 + 301^2 .

It is a junction number, because it is equal to n+sod(n) for n = 129390199 and 129390208.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32347559 + ... + 32347562.

Almost surely, 2^129390242 is an apocalyptic number.

129390242 is a deficient number, since it is larger than the sum of its proper divisors (64695124).

129390242 is an equidigital number, since it uses as much as digits as its factorization.

129390242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64695123.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 129390242 is about 11374.9831648227. The cubic root of 129390242 is about 505.7864320797.

The spelling of 129390242 in words is "one hundred twenty-nine million, three hundred ninety thousand, two hundred forty-two".