1861304427 has 24 divisors (see below), whose sum is σ = 2794122240. Its totient is φ = 1238201640.

The previous prime is 1861304413. The next prime is 1861304503. The reversal of 1861304427 is 7244031681.

1861304427 is a `hidden beast` number, since 1 + 86 + 130 + 442 + 7 = 666.

1861304427 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1861304427 - 2⁴ = 1861304411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1861304391 and 1861304400.

It is not an unprimeable number, because it can be changed into a prime (1861304327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108402 + ... + 124392.

It is an arithmetic number, because the mean of its divisors is an integer number (116421760).

Almost surely, 2^1861304427 is an apocalyptic number.

1861304427 is a deficient number, since it is larger than the sum of its proper divisors (932817813).

1861304427 is an equidigital number, since it uses as much as digits as its factorization.

1861304427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16485 (or 16473 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 1861304427 is about 43142.8374936095. The cubic root of 1861304427 is about 1230.0963696058.

The spelling of 1861304427 in words is "one billion, eight hundred sixty-one million, three hundred four thousand, four hundred twenty-seven".