18801861 has 8 divisors (see below), whose sum is σ = 26997600. Its totient is φ = 11570352.

The previous prime is 18801859. The next prime is 18801869. The reversal of 18801861 is 16810881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18801861 - 2¹ = 18801859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18801869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241011 + ... + 241088.

It is an arithmetic number, because the mean of its divisors is an integer number (3374700).

Almost surely, 2^18801861 is an apocalyptic number.

It is an amenable number.

18801861 is a deficient number, since it is larger than the sum of its proper divisors (8195739).

18801861 is a wasteful number, since it uses less digits than its factorization.

18801861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482115.

The product of its (nonzero) digits is 3072, while the sum is 33.

The square root of 18801861 is about 4336.1112762474. Note that the first 3 decimals coincide. The cubic root of 18801861 is about 265.9093525336.

It can be divided in two parts, 1880 and 1861, that added together give a triangular number (3741 = T₈₆).

The spelling of 18801861 in words is "eighteen million, eight hundred one thousand, eight hundred sixty-one".