3755821 has 2 divisors, whose sum is σ = 3755822. Its totient is φ = 3755820.

The previous prime is 3755809. The next prime is 3755837. The reversal of 3755821 is 1285573.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3279721 + 476100 = 1811^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 3755821 - 2¹³ = 3747629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3755891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1877910 + 1877911.

It is an arithmetic number, because the mean of its divisors is an integer number (1877911).

Almost surely, 2^3755821 is an apocalyptic number.

It is an amenable number.

3755821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3755821 is an equidigital number, since it uses as much as digits as its factorization.

3755821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 3755821 is about 1937.9940660384. The cubic root of 3755821 is about 155.4419712966.

The spelling of 3755821 in words is "three million, seven hundred fifty-five thousand, eight hundred twenty-one".