947639013 has 8 divisors (see below), whose sum is σ = 1263676800. Its totient is φ = 631680288.

The previous prime is 947638997. The next prime is 947639057. The reversal of 947639013 is 310936749.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 947639013 - 2⁴ = 947638997 is a prime.

It is a super-2 number, since 2×947639013² = 1796039397919228338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947639083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19153 + ... + 47561.

It is an arithmetic number, because the mean of its divisors is an integer number (157959600).

Almost surely, 2^947639013 is an apocalyptic number.

It is an amenable number.

947639013 is a deficient number, since it is larger than the sum of its proper divisors (316037787).

947639013 is a wasteful number, since it uses less digits than its factorization.

947639013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39531.

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 947639013 is about 30783.7459221583. The cubic root of 947639013 is about 982.2325240980.

The spelling of 947639013 in words is "nine hundred forty-seven million, six hundred thirty-nine thousand, thirteen".