3123720 has 48 divisors (see below), whose sum is σ = 10153260. Its totient is φ = 832896.

The previous prime is 3123713. The next prime is 3123721. The reversal of 3123720 is 273213.

It can be written as a sum of positive squares in 2 ways, for example, as 3006756 + 116964 = 1734^2 + 342^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 3123693 and 3123702.

It is not an unprimeable number, because it can be changed into a prime (3123721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3979 + ... + 4698.

Almost surely, 2^3123720 is an apocalyptic number.

3123720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3123720 is an abundant number, since it is smaller than the sum of its proper divisors (7029540).

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

3123720 is a wasteful number, since it uses less digits than its factorization.

3123720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8694 (or 8687 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 3123720 is about 1767.4048772140. The cubic root of 3123720 is about 146.1809228902.

Adding to 3123720 its reverse (273213), we get a palindrome (3396933).

The spelling of 3123720 in words is "three million, one hundred twenty-three thousand, seven hundred twenty".