1816477540 has 48 divisors (see below), whose sum is σ = 4084441200. Its totient is φ = 676155392.

The previous prime is 1816477513. The next prime is 1816477541. The reversal of 1816477540 is 457746181.

It can be written as a sum of positive squares in 8 ways, for example, as 153958464 + 1662519076 = 12408^2 + 40774^2 .

It is not an unprimeable number, because it can be changed into a prime (1816477541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246 + ... + 60274.

It is an arithmetic number, because the mean of its divisors is an integer number (85092525).

Almost surely, 2^1816477540 is an apocalyptic number.

1816477540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1816477540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2042220600).

1816477540 is an abundant number, since it is smaller than the sum of its proper divisors (2267963660).

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

1816477540 is a wasteful number, since it uses less digits than its factorization.

1816477540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60144 (or 60142 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 1816477540 is about 42620.1541527010. The cubic root of 1816477540 is about 1220.1409717956.

The spelling of 1816477540 in words is "one billion, eight hundred sixteen million, four hundred seventy-seven thousand, five hundred forty".