947398139 has 4 divisors (see below), whose sum is σ = 947459856. Its totient is φ = 947336424.

The previous prime is 947398097. The next prime is 947398163. The reversal of 947398139 is 931893749.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 947398139 - 2¹² = 947394043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (947391139) 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 in 3 ways as a sum of consecutive naturals, for example, 12137 + ... + 45189.

It is an arithmetic number, because the mean of its divisors is an integer number (236864964).

Almost surely, 2^947398139 is an apocalyptic number.

947398139 is a deficient number, since it is larger than the sum of its proper divisors (61717).

947398139 is a wasteful number, since it uses less digits than its factorization.

947398139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61716.

The product of its digits is 1469664, while the sum is 53.

The square root of 947398139 is about 30779.8333166377. The cubic root of 947398139 is about 982.1492946816.

The spelling of 947398139 in words is "nine hundred forty-seven million, three hundred ninety-eight thousand, one hundred thirty-nine".