1818437 has 2 divisors, whose sum is σ = 1818438. Its totient is φ = 1818436.

The previous prime is 1818431. The next prime is 1818451. The reversal of 1818437 is 7348181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 923521 + 894916 = 961^2 + 946^2 .

It is an emirp because it is prime and its reverse (7348181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1818437 - 2⁶ = 1818373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909218 + 909219.

It is an arithmetic number, because the mean of its divisors is an integer number (909219).

2^1818437 is an apocalyptic number.

It is an amenable number.

1818437 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818437 is an equidigital number, since it uses as much as digits as its factorization.

1818437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 32.

The square root of 1818437 is about 1348.4943455573. The cubic root of 1818437 is about 122.0579541908.

The spelling of 1818437 in words is "one million, eight hundred eighteen thousand, four hundred thirty-seven".