18401716 has 6 divisors (see below), whose sum is σ = 32203010. Its totient is φ = 9200856.

The previous prime is 18401683. The next prime is 18401717. The reversal of 18401716 is 61710481.

It can be written as a sum of positive squares in only one way, i.e., 14791716 + 3610000 = 3846^2 + 1900^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18401717) 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 as a sum of consecutive naturals, namely, 2300211 + ... + 2300218.

Almost surely, 2^18401716 is an apocalyptic number.

It is an amenable number.

18401716 is a deficient number, since it is larger than the sum of its proper divisors (13801294).

18401716 is a wasteful number, since it uses less digits than its factorization.

18401716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4600433 (or 4600431 counting only the distinct ones).

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

The square root of 18401716 is about 4289.7221355235. The cubic root of 18401716 is about 264.0094310986.

The spelling of 18401716 in words is "eighteen million, four hundred one thousand, seven hundred sixteen".