18435940 has 24 divisors (see below), whose sum is σ = 38820600. Its totient is φ = 7354368.

The previous prime is 18435929. The next prime is 18435941. The reversal of 18435940 is 4953481.

It can be written as a sum of positive squares in 4 ways, for example, as 2611456 + 15824484 = 1616^2 + 3978^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18435896 and 18435905.

It is not an unprimeable number, because it can be changed into a prime (18435941) 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, 7954 + ... + 10006.

It is an arithmetic number, because the mean of its divisors is an integer number (1617525).

Almost surely, 2^18435940 is an apocalyptic number.

18435940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18435940 is an abundant number, since it is smaller than the sum of its proper divisors (20384660).

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

18435940 is a wasteful number, since it uses less digits than its factorization.

18435940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511 (or 2509 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 18435940 is about 4293.7093520638. The cubic root of 18435940 is about 264.1730003203.

The spelling of 18435940 in words is "eighteen million, four hundred thirty-five thousand, nine hundred forty".