1861147 has 4 divisors (see below), whose sum is σ = 1921216. Its totient is φ = 1801080.

The previous prime is 1861141. The next prime is 1861151. The reversal of 1861147 is 7411681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7411681 = 23 ⋅322247.

It is a cyclic number.

It is not a de Polignac number, because 1861147 - 2⁷ = 1861019 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29988 + ... + 30049.

It is an arithmetic number, because the mean of its divisors is an integer number (480304).

2^1861147 is an apocalyptic number.

1861147 is a deficient number, since it is larger than the sum of its proper divisors (60069).

1861147 is an equidigital number, since it uses as much as digits as its factorization.

1861147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60068.

The product of its digits is 1344, while the sum is 28.

The square root of 1861147 is about 1364.2386154922. The cubic root of 1861147 is about 123.0061688580.

The spelling of 1861147 in words is "one million, eight hundred sixty-one thousand, one hundred forty-seven".