1851813840 has 40 divisors (see below), whose sum is σ = 5740623648. Its totient is φ = 493816960.

The previous prime is 1851813839. The next prime is 1851813841. The reversal of 1851813840 is 483181581.

1851813840 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1851813839) and next prime (1851813841).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851813841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3857706 + ... + 3858185.

Almost surely, 2^1851813840 is an apocalyptic number.

1851813840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1851813840 is an abundant number, since it is smaller than the sum of its proper divisors (3888809808).

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

1851813840 is a wasteful number, since it uses less digits than its factorization.

1851813840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7715907 (or 7715901 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 39.

The square root of 1851813840 is about 43032.7066311195. The cubic root of 1851813840 is about 1228.0020972777.

The spelling of 1851813840 in words is "one billion, eight hundred fifty-one million, eight hundred thirteen thousand, eight hundred forty".