1618820540 has 24 divisors (see below), whose sum is σ = 3400312272. Its totient is φ = 647377920.

The previous prime is 1618820531. The next prime is 1618820551. The reversal of 1618820540 is 450288161.

It is a self number, because there is not a number n which added to its sum of digits gives 1618820540.

It is a congruent number.

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, 127772 + ... + 139868.

It is an arithmetic number, because the mean of its divisors is an integer number (141679678).

Almost surely, 2^1618820540 is an apocalyptic number.

1618820540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1618820540 is an abundant number, since it is smaller than the sum of its proper divisors (1781491732).

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

1618820540 is a wasteful number, since it uses less digits than its factorization.

1618820540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18797 (or 18795 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 1618820540 is about 40234.5689674936. The cubic root of 1618820540 is about 1174.1751966202.

The spelling of 1618820540 in words is "one billion, six hundred eighteen million, eight hundred twenty thousand, five hundred forty".