18936479 has 4 divisors (see below), whose sum is σ = 18997680. Its totient is φ = 18875280.

The previous prime is 18936451. The next prime is 18936517. The reversal of 18936479 is 97463981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97463981 = 449 ⋅217069.

It is a cyclic number.

It is not a de Polignac number, because 18936479 - 2⁸ = 18936223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18936409) 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 3 ways as a sum of consecutive naturals, for example, 30134 + ... + 30755.

It is an arithmetic number, because the mean of its divisors is an integer number (4749420).

Almost surely, 2^18936479 is an apocalyptic number.

18936479 is a deficient number, since it is larger than the sum of its proper divisors (61201).

18936479 is an equidigital number, since it uses as much as digits as its factorization.

18936479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61200.

The product of its digits is 326592, while the sum is 47.

The square root of 18936479 is about 4351.6064849662. The cubic root of 18936479 is about 266.5424652518.

The spelling of 18936479 in words is "eighteen million, nine hundred thirty-six thousand, four hundred seventy-nine".