1819531836 has 120 divisors (see below), whose sum is σ = 4840665984. Its totient is φ = 595913760.

The previous prime is 1819531829. The next prime is 1819531841. The reversal of 1819531836 is 6381359181.

It is a happy number.

1819531836 is a `hidden beast` number, since 1 + 81 + 9 + 531 + 8 + 36 = 666.

It is a super-2 number, since 2×1819531836² = 6621392204435061792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1819531791 and 1819531800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6918241 + ... + 6918503.

Almost surely, 2^1819531836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1819531836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2420332992).

1819531836 is an abundant number, since it is smaller than the sum of its proper divisors (3021134148).

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

1819531836 is a wasteful number, since it uses less digits than its factorization.

1819531836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 562 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 1819531836 is about 42655.9706957889. The cubic root of 1819531836 is about 1220.8244530266.

The spelling of 1819531836 in words is "one billion, eight hundred nineteen million, five hundred thirty-one thousand, eight hundred thirty-six".