1947420479 has 2 divisors, whose sum is σ = 1947420480. Its totient is φ = 1947420478.

The previous prime is 1947420443. The next prime is 1947420539. The reversal of 1947420479 is 9740247491.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1947420479 - 2²⁸ = 1678985023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1947420439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 973710239 + 973710240.

It is an arithmetic number, because the mean of its divisors is an integer number (973710240).

Almost surely, 2^1947420479 is an apocalyptic number.

1947420479 is a deficient number, since it is larger than the sum of its proper divisors (1).

1947420479 is an equidigital number, since it uses as much as digits as its factorization.

1947420479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 1947420479 is about 44129.5873422809. The cubic root of 1947420479 is about 1248.7818487917.

The spelling of 1947420479 in words is "one billion, nine hundred forty-seven million, four hundred twenty thousand, four hundred seventy-nine".