3138947 has 4 divisors (see below), whose sum is σ = 3587376. Its totient is φ = 2690520.

The previous prime is 3138943. The next prime is 3138953. The reversal of 3138947 is 7498313.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3138947 - 2² = 3138943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3138943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224204 + ... + 224217.

It is an arithmetic number, because the mean of its divisors is an integer number (896844).

Almost surely, 2^3138947 is an apocalyptic number.

3138947 is a deficient number, since it is larger than the sum of its proper divisors (448429).

3138947 is an equidigital number, since it uses as much as digits as its factorization.

3138947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448428.

The product of its digits is 18144, while the sum is 35.

The square root of 3138947 is about 1771.7073686137. The cubic root of 3138947 is about 146.4180642754.

The spelling of 3138947 in words is "three million, one hundred thirty-eight thousand, nine hundred forty-seven".