18676397 has 4 divisors (see below), whose sum is σ = 18736380. Its totient is φ = 18616416.

The previous prime is 18676381. The next prime is 18676409. The reversal of 18676397 is 79367681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79367681 = 149 ⋅532669.

It can be written as a sum of positive squares in 2 ways, for example, as 5924356 + 12752041 = 2434^2 + 3571^2 .

It is a cyclic number.

It is not a de Polignac number, because 18676397 - 2⁴ = 18676381 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 (18676327) 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, 29522 + ... + 30147.

It is an arithmetic number, because the mean of its divisors is an integer number (4684095).

Almost surely, 2^18676397 is an apocalyptic number.

It is an amenable number.

18676397 is a deficient number, since it is larger than the sum of its proper divisors (59983).

18676397 is an equidigital number, since it uses as much as digits as its factorization.

18676397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59982.

The product of its digits is 381024, while the sum is 47.

The square root of 18676397 is about 4321.6197195033. The cubic root of 18676397 is about 265.3165648449.

The spelling of 18676397 in words is "eighteen million, six hundred seventy-six thousand, three hundred ninety-seven".