18492820 has 12 divisors (see below), whose sum is σ = 38834964. Its totient is φ = 7397120.

The previous prime is 18492809. The next prime is 18492827. The reversal of 18492820 is 2829481.

It can be written as a sum of positive squares in 2 ways, for example, as 2268036 + 16224784 = 1506^2 + 4028^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18492827) 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 3 ways as a sum of consecutive naturals, for example, 462301 + ... + 462340.

It is an arithmetic number, because the mean of its divisors is an integer number (3236247).

Almost surely, 2^18492820 is an apocalyptic number.

18492820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18492820 is an abundant number, since it is smaller than the sum of its proper divisors (20342144).

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

18492820 is a wasteful number, since it uses less digits than its factorization.

18492820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924650 (or 924648 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18492820 is about 4300.3278944750. The cubic root of 18492820 is about 264.4444037746. Note that the first 4 decimals are identical.

The spelling of 18492820 in words is "eighteen million, four hundred ninety-two thousand, eight hundred twenty".