1840457 has 2 divisors, whose sum is σ = 1840458. Its totient is φ = 1840456.

The previous prime is 1840453. The next prime is 1840459. The reversal of 1840457 is 7540481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1032256 + 808201 = 1016^2 + 899^2 .

It is a cyclic number.

It is not a de Polignac number, because 1840457 - 2² = 1840453 is a prime.

Together with 1840459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1840453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920228 + 920229.

It is an arithmetic number, because the mean of its divisors is an integer number (920229).

2^1840457 is an apocalyptic number.

It is an amenable number.

1840457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1840457 is an equidigital number, since it uses as much as digits as its factorization.

1840457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 1840457 is about 1356.6344386016. The cubic root of 1840457 is about 122.5486576106.

The spelling of 1840457 in words is "one million, eight hundred forty thousand, four hundred fifty-seven".