1818545640 has 32 divisors (see below), whose sum is σ = 5455637280. Its totient is φ = 484945472.

The previous prime is 1818545609. The next prime is 1818545657. The reversal of 1818545640 is 465458181.

1818545640 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1818545592 and 1818545601.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7577154 + ... + 7577393.

It is an arithmetic number, because the mean of its divisors is an integer number (170488665).

Almost surely, 2^1818545640 is an apocalyptic number.

1818545640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818545640 is an abundant number, since it is smaller than the sum of its proper divisors (3637091640).

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

1818545640 is a wasteful number, since it uses less digits than its factorization.

1818545640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15154561 (or 15154557 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 42.

The square root of 1818545640 is about 42644.4092466996. The cubic root of 1818545640 is about 1220.6038487015.

The spelling of 1818545640 in words is "one billion, eight hundred eighteen million, five hundred forty-five thousand, six hundred forty".