18861016 has 16 divisors (see below), whose sum is σ = 35604000. Its totient is φ = 9366624.

The previous prime is 18860999. The next prime is 18861019. The reversal of 18861016 is 61016881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18861019) 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, 6720 + ... + 9103.

It is an arithmetic number, because the mean of its divisors is an integer number (2225250).

Almost surely, 2^18861016 is an apocalyptic number.

It is an amenable number.

18861016 is a deficient number, since it is larger than the sum of its proper divisors (16742984).

18861016 is a wasteful number, since it uses less digits than its factorization.

18861016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15978 (or 15974 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 18861016 is about 4342.9271234963. The cubic root of 18861016 is about 266.1879313389.

Adding to 18861016 its reverse (61016881), we get a palindrome (79877897).

The spelling of 18861016 in words is "eighteen million, eight hundred sixty-one thousand, sixteen".