1853815540 has 12 divisors (see below), whose sum is σ = 3893012676. Its totient is φ = 741526208.

The previous prime is 1853815529. The next prime is 1853815547. The reversal of 1853815540 is 455183581.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 841812196 + 1012003344 = 29014^2 + 31812^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1853815493 and 1853815502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1853815547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46345369 + ... + 46345408.

It is an arithmetic number, because the mean of its divisors is an integer number (324417723).

Almost surely, 2^1853815540 is an apocalyptic number.

1853815540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1853815540 is an abundant number, since it is smaller than the sum of its proper divisors (2039197136).

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

1853815540 is a wasteful number, since it uses less digits than its factorization.

1853815540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92690786 (or 92690784 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 40.

The square root of 1853815540 is about 43055.9582404108. The cubic root of 1853815540 is about 1228.4444035530. Note that the first 4 decimals are identical.

The spelling of 1853815540 in words is "one billion, eight hundred fifty-three million, eight hundred fifteen thousand, five hundred forty".