1861313776 has 20 divisors (see below), whose sum is σ = 4121480752. Its totient is φ = 797705856.

The previous prime is 1861313771. The next prime is 1861313803. The reversal of 1861313776 is 6773131681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861313771) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 8309325 + ... + 8309548.

Almost surely, 2^1861313776 is an apocalyptic number.

1861313776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1861313776 is an abundant number, since it is smaller than the sum of its proper divisors (2260166976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1861313776 is a wasteful number, since it uses less digits than its factorization.

1861313776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16618888 (or 16618882 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The square root of 1861313776 is about 43142.9458428606. The cubic root of 1861313776 is about 1230.0984291205.

The spelling of 1861313776 in words is "one billion, eight hundred sixty-one million, three hundred thirteen thousand, seven hundred seventy-six".