1861873073 has 4 divisors (see below), whose sum is σ = 1870697328. Its totient is φ = 1853048820.

The previous prime is 1861873037. The next prime is 1861873121. The reversal of 1861873073 is 3703781681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1861873073 - 2¹² = 1861868977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861873033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4411811 + ... + 4412232.

It is an arithmetic number, because the mean of its divisors is an integer number (467674332).

Almost surely, 2^1861873073 is an apocalyptic number.

It is an amenable number.

1861873073 is a deficient number, since it is larger than the sum of its proper divisors (8824255).

1861873073 is an equidigital number, since it uses as much as digits as its factorization.

1861873073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8824254.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 1861873073 is about 43149.4272615524. The cubic root of 1861873073 is about 1230.2216255192.

The spelling of 1861873073 in words is "one billion, eight hundred sixty-one million, eight hundred seventy-three thousand, seventy-three".