3661240 has 64 divisors (see below), whose sum is σ = 9214560. Its totient is φ = 1297920.

The previous prime is 3661211. The next prime is 3661247. The reversal of 3661240 is 421663.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661247) 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, 23242 + ... + 23398.

Almost surely, 2^3661240 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 3661240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4607280).

3661240 is an abundant number, since it is smaller than the sum of its proper divisors (5553320).

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

3661240 is a wasteful number, since it uses less digits than its factorization.

3661240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 3661240 is about 1913.4366987178. The cubic root of 3661240 is about 154.1260563434.

The spelling of 3661240 in words is "three million, six hundred sixty-one thousand, two hundred forty".