1861819436 has 6 divisors (see below), whose sum is σ = 3258184020. Its totient is φ = 930909716.

The previous prime is 1861819423. The next prime is 1861819441. The reversal of 1861819436 is 6349181681.

It is a super-2 number, since 2×1861819436² = 6932743224534716192, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 232727426 + ... + 232727433.

It is an arithmetic number, because the mean of its divisors is an integer number (543030670).

Almost surely, 2^1861819436 is an apocalyptic number.

It is an amenable number.

1861819436 is a deficient number, since it is larger than the sum of its proper divisors (1396364584).

1861819436 is a wasteful number, since it uses less digits than its factorization.

1861819436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465454863 (or 465454861 counting only the distinct ones).

The product of its digits is 248832, while the sum is 47.

The square root of 1861819436 is about 43148.8057308658. The cubic root of 1861819436 is about 1230.2098119622.

The spelling of 1861819436 in words is "one billion, eight hundred sixty-one million, eight hundred nineteen thousand, four hundred thirty-six".