3721780 has 24 divisors (see below), whose sum is σ = 7852320. Its totient is φ = 1481760.

The previous prime is 3721771. The next prime is 3721787. The reversal of 3721780 is 871273.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721787) 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, 7335 + ... + 7825.

It is an arithmetic number, because the mean of its divisors is an integer number (327180).

Almost surely, 2^3721780 is an apocalyptic number.

It is an amenable number.

3721780 is an abundant number, since it is smaller than the sum of its proper divisors (4130540).

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

3721780 is a wasteful number, since it uses less digits than its factorization.

3721780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879 (or 877 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 3721780 is about 1929.1915405164. The cubic root of 3721780 is about 154.9709276033.

The spelling of 3721780 in words is "three million, seven hundred twenty-one thousand, seven hundred eighty".