19677947 has 2 divisors, whose sum is σ = 19677948. Its totient is φ = 19677946.

The previous prime is 19677919. The next prime is 19677971. The reversal of 19677947 is 74977691.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19677947 - 2⁶ = 19677883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19677895 and 19677904.

It is not a weakly prime, because it can be changed into another prime (19677907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9838973 + 9838974.

It is an arithmetic number, because the mean of its divisors is an integer number (9838974).

Almost surely, 2^19677947 is an apocalyptic number.

19677947 is a deficient number, since it is larger than the sum of its proper divisors (1).

19677947 is an equidigital number, since it uses as much as digits as its factorization.

19677947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 666792, while the sum is 50.

The square root of 19677947 is about 4435.9832055588. The cubic root of 19677947 is about 269.9768933129.

The spelling of 19677947 in words is "nineteen million, six hundred seventy-seven thousand, nine hundred forty-seven".