3721849 has 2 divisors, whose sum is σ = 3721850. Its totient is φ = 3721848.

The previous prime is 3721847. The next prime is 3721859. The reversal of 3721849 is 9481273.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2496400 + 1225449 = 1580^2 + 1107^2 .

It is a cyclic number.

It is not a de Polignac number, because 3721849 - 2¹ = 3721847 is a prime.

Together with 3721847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3721847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1860924 + 1860925.

It is an arithmetic number, because the mean of its divisors is an integer number (1860925).

Almost surely, 2^3721849 is an apocalyptic number.

It is an amenable number.

3721849 is a deficient number, since it is larger than the sum of its proper divisors (1).

3721849 is an equidigital number, since it uses as much as digits as its factorization.

3721849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 3721849 is about 1929.2094235723. The cubic root of 3721849 is about 154.9718852927.

The spelling of 3721849 in words is "three million, seven hundred twenty-one thousand, eight hundred forty-nine".