1189944905 has 8 divisors (see below), whose sum is σ = 1490018112. Its totient is φ = 910566448.

The previous prime is 1189944893. The next prime is 1189944913. The reversal of 1189944905 is 5094499811.

1189944905 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 1189944905 - 2⁸ = 1189944649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5173559 + ... + 5173788.

It is an arithmetic number, because the mean of its divisors is an integer number (186252264).

Almost surely, 2^1189944905 is an apocalyptic number.

It is an amenable number.

1189944905 is a deficient number, since it is larger than the sum of its proper divisors (300073207).

1189944905 is a wasteful number, since it uses less digits than its factorization.

1189944905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10347375.

The product of its (nonzero) digits is 466560, while the sum is 50.

The square root of 1189944905 is about 34495.5780499472. The cubic root of 1189944905 is about 1059.6821477859.

The spelling of 1189944905 in words is "one billion, one hundred eighty-nine million, nine hundred forty-four thousand, nine hundred five".