1819739140 has 24 divisors (see below), whose sum is σ = 3835063512. Its totient is φ = 725303040.

The previous prime is 1819739081. The next prime is 1819739147. The reversal of 1819739140 is 419379181.

1819739140 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 925011396 + 894727744 = 30414^2 + 29912^2 .

It is a super-2 number, since 2×1819739140² = 6622901075295879200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1819739147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156279 + ... + 167518.

It is an arithmetic number, because the mean of its divisors is an integer number (159794313).

Almost surely, 2^1819739140 is an apocalyptic number.

1819739140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1819739140 is an abundant number, since it is smaller than the sum of its proper divisors (2015324372).

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

1819739140 is a wasteful number, since it uses less digits than its factorization.

1819739140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324087 (or 324085 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 1819739140 is about 42658.4005794873. The cubic root of 1819739140 is about 1220.8708151688.

The spelling of 1819739140 in words is "one billion, eight hundred nineteen million, seven hundred thirty-nine thousand, one hundred forty".