18486840 has 32 divisors (see below), whose sum is σ = 55460880. Its totient is φ = 4929792.

The previous prime is 18486827. The next prime is 18486847. The reversal of 18486840 is 4868481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18486847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76909 + ... + 77148.

Almost surely, 2^18486840 is an apocalyptic number.

18486840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18486840 is an abundant number, since it is smaller than the sum of its proper divisors (36974040).

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

18486840 is a wasteful number, since it uses less digits than its factorization.

18486840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154071 (or 154067 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 39.

The square root of 18486840 is about 4299.6325424389. The cubic root of 18486840 is about 264.4158963499.

The spelling of 18486840 in words is "eighteen million, four hundred eighty-six thousand, eight hundred forty".