1238906906 has 8 divisors (see below), whose sum is σ = 1893423924. Its totient is φ = 607765600.

The previous prime is 1238906873. The next prime is 1238906917. The reversal of 1238906906 is 6096098321.

It can be written as a sum of positive squares in 2 ways, for example, as 1196122225 + 42784681 = 34585^2 + 6541^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5843795 + ... + 5844006.

Almost surely, 2^1238906906 is an apocalyptic number.

1238906906 is a deficient number, since it is larger than the sum of its proper divisors (654517018).

1238906906 is a wasteful number, since it uses less digits than its factorization.

1238906906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11687856.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 1238906906 is about 35198.1094094555. The cubic root of 1238906906 is about 1074.0212923197.

The spelling of 1238906906 in words is "one billion, two hundred thirty-eight million, nine hundred six thousand, nine hundred six".