18490836 has 144 divisors (see below), whose sum is σ = 56306880. Its totient is φ = 4677120.

The previous prime is 18490807. The next prime is 18490841. The reversal of 18490836 is 63809481.

It is a super-2 number, since 2×18490836² = 683822031957792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 18490794 and 18490803.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 313375 + ... + 313433.

It is an arithmetic number, because the mean of its divisors is an integer number (391020).

Almost surely, 2^18490836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18490836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28153440).

18490836 is an abundant number, since it is smaller than the sum of its proper divisors (37816044).

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

18490836 is a wasteful number, since it uses less digits than its factorization.

18490836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 18490836 is about 4300.0972082036. The cubic root of 18490836 is about 264.4349464742.

The spelling of 18490836 in words is "eighteen million, four hundred ninety thousand, eight hundred thirty-six".