3651920 has 40 divisors (see below), whose sum is σ = 8570880. Its totient is φ = 1447040.

The previous prime is 3651919. The next prime is 3651929. The reversal of 3651920 is 291563.

It is a Cunningham number, because it is equal to 1911²-1.

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

It is a self number, because there is not a number n which added to its sum of digits gives 3651920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3651929) 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, 15161 + ... + 15399.

It is an arithmetic number, because the mean of its divisors is an integer number (214272).

Almost surely, 2^3651920 is an apocalyptic number.

It is an amenable number.

3651920 is an abundant number, since it is smaller than the sum of its proper divisors (4918960).

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

3651920 is a wasteful number, since it uses less digits than its factorization.

3651920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 3651920 is about 1910.9997383569. Note that the first 3 decimals coincide. The cubic root of 3651920 is about 153.9951648563.

The spelling of 3651920 in words is "three million, six hundred fifty-one thousand, nine hundred twenty".