3215123440 has 40 divisors (see below), whose sum is σ = 7484976288. Its totient is φ = 1284360960.

The previous prime is 3215123413. The next prime is 3215123447. The reversal of 3215123440 is 443215123.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3215123447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35845 + ... + 87835.

Almost surely, 2^3215123440 is an apocalyptic number.

It is an amenable number.

3215123440 is an abundant number, since it is smaller than the sum of its proper divisors (4269852848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3215123440 is a wasteful number, since it uses less digits than its factorization.

3215123440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52777 (or 52771 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 3215123440 is about 56702.0585164243. The cubic root of 3215123440 is about 1475.9304197731.

Adding to 3215123440 its reverse (443215123), we get a palindrome (3658338563).

The spelling of 3215123440 in words is "three billion, two hundred fifteen million, one hundred twenty-three thousand, four hundred forty".