18961359 has 8 divisors (see below), whose sum is σ = 25364352. Its totient is φ = 12599640.

The previous prime is 18961357. The next prime is 18961381. The reversal of 18961359 is 95316981.

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

It is not a de Polignac number, because 18961359 - 2¹ = 18961357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18961359.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18961357) 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, 9229 + ... + 11094.

It is an arithmetic number, because the mean of its divisors is an integer number (3170544).

Almost surely, 2^18961359 is an apocalyptic number.

18961359 is a deficient number, since it is larger than the sum of its proper divisors (6402993).

18961359 is a wasteful number, since it uses less digits than its factorization.

18961359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20637.

The product of its digits is 58320, while the sum is 42.

The square root of 18961359 is about 4354.4642609625. The cubic root of 18961359 is about 266.6591478783.

The spelling of 18961359 in words is "eighteen million, nine hundred sixty-one thousand, three hundred fifty-nine".