1840393 has 2 divisors, whose sum is σ = 1840394. Its totient is φ = 1840392.

The previous prime is 1840351. The next prime is 1840429. The reversal of 1840393 is 3930481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1776889 + 63504 = 1333^2 + 252^2 .

It is an emirp because it is prime and its reverse (3930481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1840393 - 2¹⁷ = 1709321 is a prime.

It is an Ulam number.

1840393 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1840313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920196 + 920197.

It is an arithmetic number, because the mean of its divisors is an integer number (920197).

2^1840393 is an apocalyptic number.

It is an amenable number.

1840393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1840393 is an equidigital number, since it uses as much as digits as its factorization.

1840393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1840393 is about 1356.6108506127. The cubic root of 1840393 is about 122.5472370929.

It can be divided in two parts, 18403 and 93, that added together give a square (18496 = 136²).

The spelling of 1840393 in words is "one million, eight hundred forty thousand, three hundred ninety-three".