1618539840 has 448 divisors, whose sum is σ = 6032113920. Its totient is φ = 408084480.

The previous prime is 1618539827. The next prime is 1618539841. The reversal of 1618539840 is 489358161.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618539841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19500439 + ... + 19500521.

It is an arithmetic number, because the mean of its divisors is an integer number (13464540).

Almost surely, 2^1618539840 is an apocalyptic number.

1618539840 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 1618539840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3016056960).

1618539840 is an abundant number, since it is smaller than the sum of its proper divisors (4413574080).

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

1618539840 is a wasteful number, since it uses less digits than its factorization.

1618539840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 1618539840 is about 40231.0805224021. The cubic root of 1618539840 is about 1174.1073262126.

The spelling of 1618539840 in words is "one billion, six hundred eighteen million, five hundred thirty-nine thousand, eight hundred forty".