18840869 has 4 divisors (see below), whose sum is σ = 19122144. Its totient is φ = 18559596.

The previous prime is 18840847. The next prime is 18840889. The reversal of 18840869 is 96804881.

It is a happy number.

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: 96804881 = 1949 ⋅49669.

It is a cyclic number.

It is not a de Polignac number, because 18840869 - 2¹² = 18836773 is a prime.

It is a super-2 number, since 2×18840869² = 709956689350322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18840889) 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, 140537 + ... + 140670.

It is an arithmetic number, because the mean of its divisors is an integer number (4780536).

Almost surely, 2^18840869 is an apocalyptic number.

It is an amenable number.

18840869 is a deficient number, since it is larger than the sum of its proper divisors (281275).

18840869 is an equidigital number, since it uses as much as digits as its factorization.

18840869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281274.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 18840869 is about 4340.6069852038. The cubic root of 18840869 is about 266.0931185091.

The spelling of 18840869 in words is "eighteen million, eight hundred forty thousand, eight hundred sixty-nine".