1851813194 has 48 divisors (see below), whose sum is σ = 3536745120. Its totient is φ = 719076960.

The previous prime is 1851813193. The next prime is 1851813211. The reversal of 1851813194 is 4913181581.

It is a happy number.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1851813193) 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, 339017 + ... + 344435.

It is an arithmetic number, because the mean of its divisors is an integer number (73682190).

Almost surely, 2^1851813194 is an apocalyptic number.

1851813194 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1851813194 is a deficient number, since it is larger than the sum of its proper divisors (1684931926).

1851813194 is a wasteful number, since it uses less digits than its factorization.

1851813194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5763 (or 5756 counting only the distinct ones).

The product of its digits is 34560, while the sum is 41.

The square root of 1851813194 is about 43032.6991252001. The cubic root of 1851813194 is about 1228.0019544827.

The spelling of 1851813194 in words is "one billion, eight hundred fifty-one million, eight hundred thirteen thousand, one hundred ninety-four".