3121947 has 12 divisors (see below), whose sum is σ = 4747080. Its totient is φ = 1971648.

The previous prime is 3121933. The next prime is 3121961. The reversal of 3121947 is 7491213.

It is an interprime number because it is at equal distance from previous prime (3121933) and next prime (3121961).

It is not a de Polignac number, because 3121947 - 2⁸ = 3121691 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3121947.

It is not an unprimeable number, because it can be changed into a prime (3121927) 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 11 ways as a sum of consecutive naturals, for example, 8958 + ... + 9299.

It is an arithmetic number, because the mean of its divisors is an integer number (395590).

Almost surely, 2^3121947 is an apocalyptic number.

3121947 is a deficient number, since it is larger than the sum of its proper divisors (1625133).

3121947 is a wasteful number, since it uses less digits than its factorization.

3121947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18282 (or 18279 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 3121947 is about 1766.9032231563. The cubic root of 3121947 is about 146.1532605914.

The spelling of 3121947 in words is "three million, one hundred twenty-one thousand, nine hundred forty-seven".