3918557 has 2 divisors, whose sum is σ = 3918558. Its totient is φ = 3918556.

The previous prime is 3918553. The next prime is 3918569. The reversal of 3918557 is 7558193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3916441 + 2116 = 1979^2 + 46^2 .

It is an emirp because it is prime and its reverse (7558193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3918557 - 2² = 3918553 is a prime.

It is a Chen prime.

It is a nialpdrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 3918557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3918553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1959278 + 1959279.

It is an arithmetic number, because the mean of its divisors is an integer number (1959279).

Almost surely, 2^3918557 is an apocalyptic number.

It is an amenable number.

3918557 is a deficient number, since it is larger than the sum of its proper divisors (1).

3918557 is an equidigital number, since it uses as much as digits as its factorization.

3918557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 3918557 is about 1979.5345412495. The cubic root of 3918557 is about 157.6553535580.

The spelling of 3918557 in words is "three million, nine hundred eighteen thousand, five hundred fifty-seven".