1840909842 has 30 divisors (see below), whose sum is σ = 4126225719. Its totient is φ = 613454580.

The previous prime is 1840909817. The next prime is 1840909907. The reversal of 1840909842 is 2489090481.

It can be written as a sum of positive squares in only one way, i.e., 920454921 + 920454921 = 30339^2 + 30339^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=30339.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 544417 + ... + 547787.

Almost surely, 2^1840909842 is an apocalyptic number.

1840909842 is an abundant number, since it is smaller than the sum of its proper divisors (2285315877).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1840909842 is an frugal number, since it uses more digits than its factorization.

1840909842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6756 (or 3376 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1840909842 is about 42905.8252688373. The cubic root of 1840909842 is about 1225.5870776447.

Multiplying 1840909842 by its product of nonzero digits (165888), we get a square (305384851869696 = 17475264²).

The spelling of 1840909842 in words is "one billion, eight hundred forty million, nine hundred nine thousand, eight hundred forty-two".