18489457 has 4 divisors (see below), whose sum is σ = 21130816. Its totient is φ = 15848100.

The previous prime is 18489433. The next prime is 18489463. The reversal of 18489457 is 75498481.

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: 75498481 = 67 ⋅1126843.

It is a cyclic number.

It is not a de Polignac number, because 18489457 - 2¹¹ = 18487409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18489407) 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, 1320669 + ... + 1320682.

It is an arithmetic number, because the mean of its divisors is an integer number (5282704).

Almost surely, 2^18489457 is an apocalyptic number.

It is an amenable number.

18489457 is a deficient number, since it is larger than the sum of its proper divisors (2641359).

18489457 is an equidigital number, since it uses as much as digits as its factorization.

18489457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2641358.

The product of its digits is 322560, while the sum is 46.

The square root of 18489457 is about 4299.9368600016. The cubic root of 18489457 is about 264.4283726799.

The spelling of 18489457 in words is "eighteen million, four hundred eighty-nine thousand, four hundred fifty-seven".