947904487 has 2 divisors, whose sum is σ = 947904488. Its totient is φ = 947904486.

The previous prime is 947904481. The next prime is 947904533. The reversal of 947904487 is 784409749.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-947904487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (947904481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473952243 + 473952244.

It is an arithmetic number, because the mean of its divisors is an integer number (473952244).

Almost surely, 2^947904487 is an apocalyptic number.

947904487 is a deficient number, since it is larger than the sum of its proper divisors (1).

947904487 is an equidigital number, since it uses as much as digits as its factorization.

947904487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The square root of 947904487 is about 30788.0575385977. The cubic root of 947904487 is about 982.3242372389.

The spelling of 947904487 in words is "nine hundred forty-seven million, nine hundred four thousand, four hundred eighty-seven".