1819371842 has 6 divisors (see below), whose sum is σ = 2729148249. Its totient is φ = 909655760.

The previous prime is 1819371823. The next prime is 1819371857. The reversal of 1819371842 is 2481739181.

It can be written as a sum of positive squares in 2 ways, for example, as 1638711361 + 180660481 = 40481^2 + 13441^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=30161.

It is a super-2 number, since 2×1819371842² = 6620227798924945928, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1819371793 and 1819371802.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 45242 + ... + 75402.

Almost surely, 2^1819371842 is an apocalyptic number.

1819371842 is a deficient number, since it is larger than the sum of its proper divisors (909776407).

1819371842 is an frugal number, since it uses more digits than its factorization.

1819371842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60324 (or 30163 counting only the distinct ones).

The product of its digits is 96768, while the sum is 44.

The square root of 1819371842 is about 42654.0952547349. The cubic root of 1819371842 is about 1220.7886690392.

The spelling of 1819371842 in words is "one billion, eight hundred nineteen million, three hundred seventy-one thousand, eight hundred forty-two".