1918535860 has 12 divisors (see below), whose sum is σ = 4028925348. Its totient is φ = 767414336.

The previous prime is 1918535851. The next prime is 1918535881. The reversal of 1918535860 is 685358191.

It can be written as a sum of positive squares in 2 ways, for example, as 509134096 + 1409401764 = 22564^2 + 37542^2 .

It is a super-2 number, since 2×1918535860² = 7361559692211879200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1918535860.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47963377 + ... + 47963416.

It is an arithmetic number, because the mean of its divisors is an integer number (335743779).

Almost surely, 2^1918535860 is an apocalyptic number.

1918535860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1918535860 is an abundant number, since it is smaller than the sum of its proper divisors (2110389488).

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

1918535860 is a wasteful number, since it uses less digits than its factorization.

1918535860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95926802 (or 95926800 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 1918535860 is about 43801.0942785680. The cubic root of 1918535860 is about 1242.5769898598.

The spelling of 1918535860 in words is "one billion, nine hundred eighteen million, five hundred thirty-five thousand, eight hundred sixty".