18992040 has 64 divisors (see below), whose sum is σ = 57576960. Its totient is φ = 5011200.

The previous prime is 18992033. The next prime is 18992047. The reversal of 18992040 is 4029981.

It is an interprime number because it is at equal distance from previous prime (18992033) and next prime (18992047).

It is a junction number, because it is equal to n+sod(n) for n = 18991992 and 18992010.

It is not an unprimeable number, because it can be changed into a prime (18992047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11337 + ... + 12903.

It is an arithmetic number, because the mean of its divisors is an integer number (899640).

Almost surely, 2^18992040 is an apocalyptic number.

18992040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18992040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28788480).

18992040 is an abundant number, since it is smaller than the sum of its proper divisors (38584920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18992040 is a wasteful number, since it uses less digits than its factorization.

18992040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 18992040 is about 4357.9857732673. The cubic root of 18992040 is about 266.8028956721.

It can be divided in two parts, 189 and 92040, that added together give a palindrome (92229).

The spelling of 18992040 in words is "eighteen million, nine hundred ninety-two thousand, forty".