3651440 has 40 divisors (see below), whose sum is σ = 9145248. Its totient is φ = 1347840.

The previous prime is 3651409. The next prime is 3651443. The reversal of 3651440 is 441563.

It is a happy number.

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 (3651443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 716 + ... + 2795.

Almost surely, 2^3651440 is an apocalyptic number.

It is an amenable number.

3651440 is an abundant number, since it is smaller than the sum of its proper divisors (5493808).

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

3651440 is a wasteful number, since it uses less digits than its factorization.

3651440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537 (or 3531 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 3651440 is about 1910.8741455156. The cubic root of 3651440 is about 153.9884176368.

The spelling of 3651440 in words is "three million, six hundred fifty-one thousand, four hundred forty".