1209975947 has 4 divisors (see below), whose sum is σ = 1214576880. Its totient is φ = 1205375016.

The previous prime is 1209975941. The next prime is 1209975989. The reversal of 1209975947 is 7495799021.

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

It is a cyclic number.

It is not a de Polignac number, because 1209975947 - 2⁸ = 1209975691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209975941) by changing a digit.

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, 2300072 + ... + 2300597.

It is an arithmetic number, because the mean of its divisors is an integer number (303644220).

Almost surely, 2^1209975947 is an apocalyptic number.

1209975947 is a deficient number, since it is larger than the sum of its proper divisors (4600933).

1209975947 is an equidigital number, since it uses as much as digits as its factorization.

1209975947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4600932.

The product of its (nonzero) digits is 1428840, while the sum is 53.

The square root of 1209975947 is about 34784.7085225678. The cubic root of 1209975947 is about 1065.5951758574.

The spelling of 1209975947 in words is "one billion, two hundred nine million, nine hundred seventy-five thousand, nine hundred forty-seven".