1819081444 has 6 divisors (see below), whose sum is σ = 3183392534. Its totient is φ = 909540720.

The previous prime is 1819081441. The next prime is 1819081469. The reversal of 1819081444 is 4441809181.

It can be written as a sum of positive squares in only one way, i.e., 1506216100 + 312865344 = 38810^2 + 17688^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1819081397 and 1819081406.

It is not an unprimeable number, because it can be changed into a prime (1819081441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 227385177 + ... + 227385184.

Almost surely, 2^1819081444 is an apocalyptic number.

It is an amenable number.

1819081444 is a deficient number, since it is larger than the sum of its proper divisors (1364311090).

1819081444 is a wasteful number, since it uses less digits than its factorization.

1819081444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454770365 (or 454770363 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 1819081444 is about 42650.6910143318. The cubic root of 1819081444 is about 1220.7237137538.

The spelling of 1819081444 in words is "one billion, eight hundred nineteen million, eighty-one thousand, four hundred forty-four".