1809118942 has 4 divisors (see below), whose sum is σ = 2713678416. Its totient is φ = 904559470.

The previous prime is 1809118939. The next prime is 1809118951. The reversal of 1809118942 is 2498119081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2498119081 = 36011 ⋅69371.

It is a super-2 number, since 2×1809118942² = 6545822692606398728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452279734 + ... + 452279737.

It is an arithmetic number, because the mean of its divisors is an integer number (678419604).

Almost surely, 2^1809118942 is an apocalyptic number.

1809118942 is a deficient number, since it is larger than the sum of its proper divisors (904559474).

1809118942 is an equidigital number, since it uses as much as digits as its factorization.

1809118942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904559473.

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 1809118942 is about 42533.7388669277. The cubic root of 1809118942 is about 1218.4911342833.

The spelling of 1809118942 in words is "one billion, eight hundred nine million, one hundred eighteen thousand, nine hundred forty-two".