3721620 has 48 divisors (see below), whose sum is σ = 11910528. Its totient is φ = 850560.

The previous prime is 3721603. The next prime is 3721621. The reversal of 3721620 is 261273.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721621) 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, 4011 + ... + 4850.

It is an arithmetic number, because the mean of its divisors is an integer number (248136).

Almost surely, 2^3721620 is an apocalyptic number.

3721620 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3721620 is an abundant number, since it is smaller than the sum of its proper divisors (8188908).

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

3721620 is a wasteful number, since it uses less digits than its factorization.

3721620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8880 (or 8878 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 3721620 is about 1929.1500719229. The cubic root of 3721620 is about 154.9687068286.

Adding to 3721620 its reverse (261273), we get a palindrome (3982893).

The spelling of 3721620 in words is "three million, seven hundred twenty-one thousand, six hundred twenty".