3720121 has 2 divisors, whose sum is σ = 3720122. Its totient is φ = 3720120.

The previous prime is 3720113. The next prime is 3720137. The reversal of 3720121 is 1210273.

It is a happy number.

It is an a-pointer prime, because the next prime (3720137) can be obtained adding 3720121 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3097600 + 622521 = 1760^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 3720121 - 2³ = 3720113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3720095 and 3720104.

It is not a weakly prime, because it can be changed into another prime (3720151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1860060 + 1860061.

It is an arithmetic number, because the mean of its divisors is an integer number (1860061).

Almost surely, 2^3720121 is an apocalyptic number.

It is an amenable number.

3720121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3720121 is an equidigital number, since it uses as much as digits as its factorization.

3720121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 3720121 is about 1928.7615197323. The cubic root of 3720121 is about 154.9478978541.

Adding to 3720121 its reverse (1210273), we get a palindrome (4930394).

The spelling of 3720121 in words is "three million, seven hundred twenty thousand, one hundred twenty-one".