1679999947 has 2 divisors, whose sum is σ = 1679999948. Its totient is φ = 1679999946.

The previous prime is 1679999917. The next prime is 1679999983. The reversal of 1679999947 is 7499999761.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1679999947 - 2¹⁹ = 1679475659 is a prime.

It is not a weakly prime, because it can be changed into another prime (1679999917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839999973 + 839999974.

It is an arithmetic number, because the mean of its divisors is an integer number (839999974).

Almost surely, 2^1679999947 is an apocalyptic number.

1679999947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1679999947 is an equidigital number, since it uses as much as digits as its factorization.

1679999947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69441624, while the sum is 70.

The square root of 1679999947 is about 40987.8024173046. The cubic root of 1679999947 is about 1188.7843780515.

The spelling of 1679999947 in words is "one billion, six hundred seventy-nine million, nine hundred ninety-nine thousand, nine hundred forty-seven".