1840605394 has 4 divisors (see below), whose sum is σ = 2760908094. Its totient is φ = 920302696.

The previous prime is 1840605343. The next prime is 1840605421. The reversal of 1840605394 is 4935060481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1257624369 + 582981025 = 35463^2 + 24145^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460151347 + ... + 460151350.

Almost surely, 2^1840605394 is an apocalyptic number.

1840605394 is a deficient number, since it is larger than the sum of its proper divisors (920302700).

1840605394 is an equidigital number, since it uses as much as digits as its factorization.

1840605394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920302699.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 1840605394 is about 42902.2772589055. The cubic root of 1840605394 is about 1225.5195117601.

The spelling of 1840605394 in words is "one billion, eight hundred forty million, six hundred five thousand, three hundred ninety-four".