1861847827 has 16 divisors (see below), whose sum is σ = 2148868800. Its totient is φ = 1580156928.

The previous prime is 1861847789. The next prime is 1861847873. The reversal of 1861847827 is 7287481681.

It is a de Polignac number, because none of the positive numbers 2^k-1861847827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861847887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348843 + ... + 354139.

It is an arithmetic number, because the mean of its divisors is an integer number (134304300).

Almost surely, 2^1861847827 is an apocalyptic number.

1861847827 is a deficient number, since it is larger than the sum of its proper divisors (287020973).

1861847827 is a wasteful number, since it uses less digits than its factorization.

1861847827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5790.

The product of its digits is 1204224, while the sum is 52.

The square root of 1861847827 is about 43149.1347190184. The cubic root of 1861847827 is about 1230.2160651124.

The spelling of 1861847827 in words is "one billion, eight hundred sixty-one million, eight hundred forty-seven thousand, eight hundred twenty-seven".