63939947 has 2 divisors, whose sum is σ = 63939948. Its totient is φ = 63939946.

The previous prime is 63939929. The next prime is 63939961. The reversal of 63939947 is 74993936.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63939947 - 2²⁰ = 62891371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63939895 and 63939904.

It is not a weakly prime, because it can be changed into another prime (63939247) 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, 31969973 + 31969974.

It is an arithmetic number, because the mean of its divisors is an integer number (31969974).

Almost surely, 2^63939947 is an apocalyptic number.

63939947 is a deficient number, since it is larger than the sum of its proper divisors (1).

63939947 is an equidigital number, since it uses as much as digits as its factorization.

63939947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 50.

The square root of 63939947 is about 7996.2458066270. The cubic root of 63939947 is about 399.8748504314.

The spelling of 63939947 in words is "sixty-three million, nine hundred thirty-nine thousand, nine hundred forty-seven".