3640340 has 24 divisors (see below), whose sum is σ = 8340192. Its totient is φ = 1323680.

The previous prime is 3640333. The next prime is 3640369. The reversal of 3640340 is 430463.

It is a happy number.

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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8054 + ... + 8493.

It is an arithmetic number, because the mean of its divisors is an integer number (347508).

Almost surely, 2^3640340 is an apocalyptic number.

It is an amenable number.

3640340 is an abundant number, since it is smaller than the sum of its proper divisors (4699852).

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

3640340 is a wasteful number, since it uses less digits than its factorization.

3640340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16567 (or 16565 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 3640340 is about 1907.9675049644. The cubic root of 3640340 is about 153.8322229694.

The spelling of 3640340 in words is "three million, six hundred forty thousand, three hundred forty".