1866437 has 2 divisors, whose sum is σ = 1866438. Its totient is φ = 1866436.

The previous prime is 1866409. The next prime is 1866439. The reversal of 1866437 is 7346681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1705636 + 160801 = 1306^2 + 401^2 .

It is a cyclic number.

It is not a de Polignac number, because 1866437 - 2⁶ = 1866373 is a prime.

Together with 1866439, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1866397 and 1866406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1866439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933218 + 933219.

It is an arithmetic number, because the mean of its divisors is an integer number (933219).

2^1866437 is an apocalyptic number.

It is an amenable number.

1866437 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866437 is an equidigital number, since it uses as much as digits as its factorization.

1866437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 1866437 is about 1366.1760501487. The cubic root of 1866437 is about 123.1226001233.

The spelling of 1866437 in words is "one million, eight hundred sixty-six thousand, four hundred thirty-seven".