3993557 has 2 divisors, whose sum is σ = 3993558. Its totient is φ = 3993556.

The previous prime is 3993547. The next prime is 3993569. The reversal of 3993557 is 7553993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3243601 + 749956 = 1801^2 + 866^2 .

It is an emirp because it is prime and its reverse (7553993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3993557 - 2¹⁰ = 3992533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3993527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996778 + 1996779.

It is an arithmetic number, because the mean of its divisors is an integer number (1996779).

Almost surely, 2^3993557 is an apocalyptic number.

It is an amenable number.

3993557 is a deficient number, since it is larger than the sum of its proper divisors (1).

3993557 is an equidigital number, since it uses as much as digits as its factorization.

3993557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127575, while the sum is 41.

The square root of 3993557 is about 1998.3886008482. The cubic root of 3993557 is about 158.6548291862.

The spelling of 3993557 in words is "three million, nine hundred ninety-three thousand, five hundred fifty-seven".