1840605345 has 24 divisors (see below), whose sum is σ = 3194591400. Its totient is φ = 980361216.

The previous prime is 1840605343. The next prime is 1840605421. The reversal of 1840605345 is 5435060481.

It is a happy number.

1840605345 is a `hidden beast` number, since 1 + 8 + 4 + 0 + 605 + 3 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 562685841 + 1277919504 = 23721^2 + 35748^2 .

It is not a de Polignac number, because 1840605345 - 2¹ = 1840605343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1840605341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8011 + ... + 61199.

It is an arithmetic number, because the mean of its divisors is an integer number (133107975).

Almost surely, 2^1840605345 is an apocalyptic number.

1840605345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1840605345 is a deficient number, since it is larger than the sum of its proper divisors (1353986055).

1840605345 is a wasteful number, since it uses less digits than its factorization.

1840605345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53969 (or 53966 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 1840605345 is about 42902.2766878402. The cubic root of 1840605345 is about 1225.5195008850.

The spelling of 1840605345 in words is "one billion, eight hundred forty million, six hundred five thousand, three hundred forty-five".