1815022540 has 24 divisors (see below), whose sum is σ = 3818615472. Its totient is φ = 724662720.

The previous prime is 1815022513. The next prime is 1815022543. The reversal of 1815022540 is 452205181.

It is a junction number, because it is equal to n+sod(n) for n = 1815022499 and 1815022508.

It is not an unprimeable number, because it can be changed into a prime (1815022543) 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, 73054 + ... + 94693.

It is an arithmetic number, because the mean of its divisors is an integer number (159108978).

Almost surely, 2^1815022540 is an apocalyptic number.

1815022540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1815022540 is an abundant number, since it is smaller than the sum of its proper divisors (2003592932).

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

1815022540 is a wasteful number, since it uses less digits than its factorization.

1815022540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168297 (or 168295 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 1815022540 is about 42603.0813439591. The cubic root of 1815022540 is about 1219.8151068009.

The spelling of 1815022540 in words is "one billion, eight hundred fifteen million, twenty-two thousand, five hundred forty".