3737821 has 2 divisors, whose sum is σ = 3737822. Its totient is φ = 3737820.

The previous prime is 3737791. The next prime is 3737837. The reversal of 3737821 is 1287373.

3737821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2856100 + 881721 = 1690^2 + 939^2 .

It is an emirp because it is prime and its reverse (1287373) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3737821 - 2¹¹ = 3735773 is a prime.

3737821 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3737521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1868910 + 1868911.

It is an arithmetic number, because the mean of its divisors is an integer number (1868911).

Almost surely, 2^3737821 is an apocalyptic number.

It is an amenable number.

3737821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3737821 is an equidigital number, since it uses as much as digits as its factorization.

3737821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 3737821 is about 1933.3445114619. The cubic root of 3737821 is about 155.1932518455.

The spelling of 3737821 in words is "three million, seven hundred thirty-seven thousand, eight hundred twenty-one".