947977989 has 8 divisors (see below), whose sum is σ = 1444537920. Its totient is φ = 541701696.

The previous prime is 947977973. The next prime is 947977991. The reversal of 947977989 is 989779749.

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

It is not a de Polignac number, because 947977989 - 2⁴ = 947977973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947977189) 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, 22570884 + ... + 22570925.

It is an arithmetic number, because the mean of its divisors is an integer number (180567240).

Almost surely, 2^947977989 is an apocalyptic number.

It is an amenable number.

947977989 is a deficient number, since it is larger than the sum of its proper divisors (496559931).

947977989 is a wasteful number, since it uses less digits than its factorization.

947977989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45141819.

The product of its digits is 72013536, while the sum is 69.

The square root of 947977989 is about 30789.2511925834. The cubic root of 947977989 is about 982.3496269031.

The spelling of 947977989 in words is "nine hundred forty-seven million, nine hundred seventy-seven thousand, nine hundred eighty-nine".