1197861905 has 16 divisors (see below), whose sum is σ = 1522831104. Its totient is φ = 901420800.

The previous prime is 1197861901. The next prime is 1197861937. The reversal of 1197861905 is 5091687911.

It is not a de Polignac number, because 1197861905 - 2² = 1197861901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1197861905.

It is not an unprimeable number, because it can be changed into a prime (1197861901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239864 + ... + 244806.

It is an arithmetic number, because the mean of its divisors is an integer number (95176944).

Almost surely, 2^1197861905 is an apocalyptic number.

It is an amenable number.

1197861905 is a deficient number, since it is larger than the sum of its proper divisors (324969199).

1197861905 is a wasteful number, since it uses less digits than its factorization.

1197861905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7816.

The product of its (nonzero) digits is 136080, while the sum is 47.

The square root of 1197861905 is about 34610.1416495223. The cubic root of 1197861905 is about 1062.0270648146.

The spelling of 1197861905 in words is "one billion, one hundred ninety-seven million, eight hundred sixty-one thousand, nine hundred five".