18729361 has 8 divisors (see below), whose sum is σ = 21602240. Its totient is φ = 15905808.

The previous prime is 18729349. The next prime is 18729367. The reversal of 18729361 is 16392781.

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

It is a cyclic number.

It is not a de Polignac number, because 18729361 - 2⁵ = 18729329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18729361.

It is not an unprimeable number, because it can be changed into a prime (18729367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11511 + ... + 13036.

It is an arithmetic number, because the mean of its divisors is an integer number (2700280).

Almost surely, 2^18729361 is an apocalyptic number.

It is an amenable number.

18729361 is a deficient number, since it is larger than the sum of its proper divisors (2872879).

18729361 is a wasteful number, since it uses less digits than its factorization.

18729361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24663.

The product of its digits is 18144, while the sum is 37.

The square root of 18729361 is about 4327.7431762987. The cubic root of 18729361 is about 265.5671300183.

The spelling of 18729361 in words is "eighteen million, seven hundred twenty-nine thousand, three hundred sixty-one".