3618421 has 2 divisors, whose sum is σ = 3618422. Its totient is φ = 3618420.

The previous prime is 3618409. The next prime is 3618443. The reversal of 3618421 is 1248163.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2937796 + 680625 = 1714^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 3618421 - 2¹¹ = 3616373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3616421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1809210 + 1809211.

It is an arithmetic number, because the mean of its divisors is an integer number (1809211).

Almost surely, 2^3618421 is an apocalyptic number.

It is an amenable number.

3618421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3618421 is an equidigital number, since it uses as much as digits as its factorization.

3618421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 3618421 is about 1902.2147617974. The cubic root of 3618421 is about 153.5228527198.

The spelling of 3618421 in words is "three million, six hundred eighteen thousand, four hundred twenty-one".