384999947 has 2 divisors, whose sum is σ = 384999948. Its totient is φ = 384999946.

The previous prime is 384999841. The next prime is 384999959. The reversal of 384999947 is 749999483.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 384999947 - 2¹⁰ = 384998923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 384999947.

It is not a weakly prime, because it can be changed into another prime (384999977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192499973 + 192499974.

It is an arithmetic number, because the mean of its divisors is an integer number (192499974).

Almost surely, 2^384999947 is an apocalyptic number.

384999947 is a deficient number, since it is larger than the sum of its proper divisors (1).

384999947 is an equidigital number, since it uses as much as digits as its factorization.

384999947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 62.

The square root of 384999947 is about 19621.4155197835. The cubic root of 384999947 is about 727.4786014970.

The spelling of 384999947 in words is "three hundred eighty-four million, nine hundred ninety-nine thousand, nine hundred forty-seven".