1209347947 has 2 divisors, whose sum is σ = 1209347948. Its totient is φ = 1209347946.

The previous prime is 1209347927. The next prime is 1209347963. The reversal of 1209347947 is 7497439021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1209347947 - 2¹⁹ = 1208823659 is a prime.

It is a super-2 number, since 2×1209347947² = 2925044913826229618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1209347897 and 1209347906.

It is not a weakly prime, because it can be changed into another prime (1209347917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604673973 + 604673974.

It is an arithmetic number, because the mean of its divisors is an integer number (604673974).

Almost surely, 2^1209347947 is an apocalyptic number.

1209347947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209347947 is an equidigital number, since it uses as much as digits as its factorization.

1209347947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 1209347947 is about 34775.6803959319. The cubic root of 1209347947 is about 1065.4107893881.

It can be divided in two parts, 120934 and 7947, that added together give a square (128881 = 359²).

The spelling of 1209347947 in words is "one billion, two hundred nine million, three hundred forty-seven thousand, nine hundred forty-seven".