3751220 has 72 divisors (see below), whose sum is σ = 9283680. Its totient is φ = 1262080.

The previous prime is 3751219. The next prime is 3751229. The reversal of 3751220 is 221573.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 3751192 and 3751201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3751229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63551 + ... + 63609.

It is an arithmetic number, because the mean of its divisors is an integer number (128940).

Almost surely, 2^3751220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3751220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4641840).

3751220 is an abundant number, since it is smaller than the sum of its proper divisors (5532460).

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

3751220 is a wasteful number, since it uses less digits than its factorization.

3751220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 3751220 is about 1936.8066501332. The cubic root of 3751220 is about 155.3784715761.

Adding to 3751220 its reverse (221573), we get a palindrome (3972793).

The spelling of 3751220 in words is "three million, seven hundred fifty-one thousand, two hundred twenty".