18840425 has 6 divisors (see below), whose sum is σ = 23362158. Its totient is φ = 15072320.

The previous prime is 18840397. The next prime is 18840433. The reversal of 18840425 is 52404881.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 65536 + 18774889 = 256^2 + 4333^2 .

It is not a de Polignac number, because 18840425 - 2¹² = 18836329 is a prime.

It is a super-2 number, since 2×18840425² = 709923228361250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18840391 and 18840400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 376784 + ... + 376833.

It is an arithmetic number, because the mean of its divisors is an integer number (3893693).

Almost surely, 2^18840425 is an apocalyptic number.

It is an amenable number.

18840425 is a deficient number, since it is larger than the sum of its proper divisors (4521733).

18840425 is an equidigital number, since it uses as much as digits as its factorization.

18840425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753627 (or 753622 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 18840425 is about 4340.5558399818. Note that the first 3 decimals coincide. The cubic root of 18840425 is about 266.0910282610.

The spelling of 18840425 in words is "eighteen million, eight hundred forty thousand, four hundred twenty-five".