1819942408 has 16 divisors (see below), whose sum is σ = 3476777580. Its totient is φ = 892801728.

The previous prime is 1819942391. The next prime is 1819942409. The reversal of 1819942408 is 8042499181.

It can be written as a sum of positive squares in 2 ways, for example, as 1749079684 + 70862724 = 41822^2 + 8418^2 .

It is not an unprimeable number, because it can be changed into a prime (1819942409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2145735 + ... + 2146582.

Almost surely, 2^1819942408 is an apocalyptic number.

It is an amenable number.

1819942408 is a deficient number, since it is larger than the sum of its proper divisors (1656835172).

1819942408 is a wasteful number, since it uses less digits than its factorization.

1819942408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4292376 (or 4292372 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 1819942408 is about 42660.7830214121. The cubic root of 1819942408 is about 1220.9162712682.

The spelling of 1819942408 in words is "one billion, eight hundred nineteen million, nine hundred forty-two thousand, four hundred eight".