1209947 has 2 divisors, whose sum is σ = 1209948. Its totient is φ = 1209946.

The previous prime is 1209931. The next prime is 1209959. The reversal of 1209947 is 7499021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1209947 - 2⁴ = 1209931 is a prime.

It is not a weakly prime, because it can be changed into another prime (1209347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604973 + 604974.

It is an arithmetic number, because the mean of its divisors is an integer number (604974).

2^1209947 is an apocalyptic number.

1209947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209947 is an equidigital number, since it uses as much as digits as its factorization.

1209947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1209947 is about 1099.9759088271. The cubic root of 1209947 is about 106.5586678160.

The spelling of 1209947 in words is "one million, two hundred nine thousand, nine hundred forty-seven".