3115640 has 64 divisors (see below), whose sum is σ = 7832160. Its totient is φ = 1105920.

The previous prime is 3115633. The next prime is 3115643. The reversal of 3115640 is 465113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3115643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32072 + ... + 32168.

Almost surely, 2^3115640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3115640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3916080).

3115640 is an abundant number, since it is smaller than the sum of its proper divisors (4716520).

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

3115640 is a wasteful number, since it uses less digits than its factorization.

3115640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 3115640 is about 1765.1175598243. The cubic root of 3115640 is about 146.0547739687.

The spelling of 3115640 in words is "three million, one hundred fifteen thousand, six hundred forty".