18642340 has 12 divisors (see below), whose sum is σ = 39148956. Its totient is φ = 7456928.

The previous prime is 18642329. The next prime is 18642343. The reversal of 18642340 is 4324681.

It can be written as a sum of positive squares in 2 ways, for example, as 9205156 + 9437184 = 3034^2 + 3072^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18642299 and 18642308.

It is not an unprimeable number, because it can be changed into a prime (18642343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466039 + ... + 466078.

It is an arithmetic number, because the mean of its divisors is an integer number (3262413).

Almost surely, 2^18642340 is an apocalyptic number.

18642340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18642340 is an abundant number, since it is smaller than the sum of its proper divisors (20506616).

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

18642340 is a wasteful number, since it uses less digits than its factorization.

18642340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932126 (or 932124 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 18642340 is about 4317.6776164971. The cubic root of 18642340 is about 265.1551956717.

The spelling of 18642340 in words is "eighteen million, six hundred forty-two thousand, three hundred forty".