1819947028 has 6 divisors (see below), whose sum is σ = 3184907306. Its totient is φ = 909973512.

The previous prime is 1819947023. The next prime is 1819947037. The reversal of 1819947028 is 8207499181.

It can be written as a sum of positive squares in only one way, i.e., 1819704964 + 242064 = 42658^2 + 492^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1819947023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 227493375 + ... + 227493382.

Almost surely, 2^1819947028 is an apocalyptic number.

It is an amenable number.

1819947028 is a deficient number, since it is larger than the sum of its proper divisors (1364960278).

1819947028 is a wasteful number, since it uses less digits than its factorization.

1819947028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454986761 (or 454986759 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 49.

The square root of 1819947028 is about 42660.8371694696. The cubic root of 1819947028 is about 1220.9173043830.

The spelling of 1819947028 in words is "one billion, eight hundred nineteen million, nine hundred forty-seven thousand, twenty-eight".