3129947 has 2 divisors, whose sum is σ = 3129948. Its totient is φ = 3129946.

The previous prime is 3129943. The next prime is 3129953. The reversal of 3129947 is 7499213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3129947 - 2² = 3129943 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3129943) 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 as a sum of consecutive naturals, namely, 1564973 + 1564974.

It is an arithmetic number, because the mean of its divisors is an integer number (1564974).

Almost surely, 2^3129947 is an apocalyptic number.

3129947 is a deficient number, since it is larger than the sum of its proper divisors (1).

3129947 is an equidigital number, since it uses as much as digits as its factorization.

3129947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 35.

The square root of 3129947 is about 1769.1656225464. The cubic root of 3129947 is about 146.2779935213.

The spelling of 3129947 in words is "three million, one hundred twenty-nine thousand, nine hundred forty-seven".