947888421 has 4 divisors (see below), whose sum is σ = 1263851232. Its totient is φ = 631925612.

The previous prime is 947888393. The next prime is 947888477. The reversal of 947888421 is 124888749.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 947888421 - 2⁹ = 947887909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947868421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157981401 + ... + 157981406.

It is an arithmetic number, because the mean of its divisors is an integer number (315962808).

Almost surely, 2^947888421 is an apocalyptic number.

It is an amenable number.

947888421 is a deficient number, since it is larger than the sum of its proper divisors (315962811).

947888421 is a wasteful number, since it uses less digits than its factorization.

947888421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315962810.

The product of its digits is 1032192, while the sum is 51.

The square root of 947888421 is about 30787.7966246368. The cubic root of 947888421 is about 982.3186874145.

The spelling of 947888421 in words is "nine hundred forty-seven million, eight hundred eighty-eight thousand, four hundred twenty-one".