1918840500 has 108 divisors (see below), whose sum is σ = 6062586348. Its totient is φ = 510907200.

The previous prime is 1918840499. The next prime is 1918840519. The reversal of 1918840500 is 50488191.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 6 ways, for example, as 1154096784 + 764743716 = 33972^2 + 27654^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2938174 + ... + 2938826.

Almost surely, 2^1918840500 is an apocalyptic number.

1918840500 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 1918840500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3031293174).

1918840500 is an abundant number, since it is smaller than the sum of its proper divisors (4143745848).

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

1918840500 is an equidigital number, since it uses as much as digits as its factorization.

1918840500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 1918840500 is about 43804.5716792209. The cubic root of 1918840500 is about 1242.6427550487.

Multiplying 1918840500 by its product of nonzero digits (11520), we get a square (22105042560000 = 4701600²).

The spelling of 1918840500 in words is "one billion, nine hundred eighteen million, eight hundred forty thousand, five hundred".