1947420439 has 2 divisors, whose sum is σ = 1947420440. Its totient is φ = 1947420438.

The previous prime is 1947420379. The next prime is 1947420443. The reversal of 1947420439 is 9340247491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1947420439 - 2²¹ = 1945323287 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1947420395 and 1947420404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1947420479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 973710219 + 973710220.

It is an arithmetic number, because the mean of its divisors is an integer number (973710220).

Almost surely, 2^1947420439 is an apocalyptic number.

1947420439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1947420439 is an equidigital number, since it uses as much as digits as its factorization.

1947420439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 1947420439 is about 44129.5868890702. The cubic root of 1947420439 is about 1248.7818402417.

The spelling of 1947420439 in words is "one billion, nine hundred forty-seven million, four hundred twenty thousand, four hundred thirty-nine".