3721980 has 96 divisors (see below), whose sum is σ = 11430720. Its totient is φ = 901120.

The previous prime is 3721973. The next prime is 3721981. The reversal of 3721980 is 891273.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41776 + ... + 41864.

It is an arithmetic number, because the mean of its divisors is an integer number (119070).

Almost surely, 2^3721980 is an apocalyptic number.

3721980 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3721980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5715360).

3721980 is an abundant number, since it is smaller than the sum of its proper divisors (7708740).

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

3721980 is a wasteful number, since it uses less digits than its factorization.

3721980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 3721980 is about 1929.2433750048. The cubic root of 3721980 is about 154.9737034820.

The spelling of 3721980 in words is "three million, seven hundred twenty-one thousand, nine hundred eighty".