3215745 has 48 divisors (see below), whose sum is σ = 6289920. Its totient is φ = 1507968.

The previous prime is 3215743. The next prime is 3215747. The reversal of 3215745 is 5475123.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3215743) and next prime (3215747).

It is not a de Polignac number, because 3215745 - 2¹ = 3215743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3215741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13336 + ... + 13574.

It is an arithmetic number, because the mean of its divisors is an integer number (131040).

Almost surely, 2^3215745 is an apocalyptic number.

3215745 is the 897-th decagonal number.

It is an amenable number.

3215745 is a deficient number, since it is larger than the sum of its proper divisors (3074175).

3215745 is a wasteful number, since it uses less digits than its factorization.

3215745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286 (or 283 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 3215745 is about 1793.2498431619. The cubic root of 3215745 is about 147.6025524489.

The spelling of 3215745 in words is "three million, two hundred fifteen thousand, seven hundred forty-five".