3720989 has 2 divisors, whose sum is σ = 3720990. Its totient is φ = 3720988.

The previous prime is 3720947. The next prime is 3721027. The reversal of 3720989 is 9890273.

It is an a-pointer prime, because the next prime (3721027) can be obtained adding 3720989 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3276100 + 444889 = 1810^2 + 667^2 .

It is a cyclic number.

It is not a de Polignac number, because 3720989 - 2²⁰ = 2672413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3720929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1860494 + 1860495.

It is an arithmetic number, because the mean of its divisors is an integer number (1860495).

Almost surely, 2^3720989 is an apocalyptic number.

It is an amenable number.

3720989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3720989 is an equidigital number, since it uses as much as digits as its factorization.

3720989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 3720989 is about 1928.9865214666. The cubic root of 3720989 is about 154.9599480282.

The spelling of 3720989 in words is "three million, seven hundred twenty thousand, nine hundred eighty-nine".