18464689 has 4 divisors (see below), whose sum is σ = 18575424. Its totient is φ = 18353956.

The previous prime is 18464659. The next prime is 18464701. The reversal of 18464689 is 98646481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98646481 = 541 ⋅182341.

It is a cyclic number.

It is not a de Polignac number, because 18464689 - 2¹¹ = 18462641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18464659) 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, 55117 + ... + 55450.

It is an arithmetic number, because the mean of its divisors is an integer number (4643856).

Almost surely, 2^18464689 is an apocalyptic number.

It is an amenable number.

18464689 is a deficient number, since it is larger than the sum of its proper divisors (110735).

18464689 is a wasteful number, since it uses less digits than its factorization.

18464689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110734.

The product of its digits is 331776, while the sum is 46.

The square root of 18464689 is about 4297.0558525577. The cubic root of 18464689 is about 264.3102461071.

The spelling of 18464689 in words is "eighteen million, four hundred sixty-four thousand, six hundred eighty-nine".