18425738 has 4 divisors (see below), whose sum is σ = 27638610. Its totient is φ = 9212868.

The previous prime is 18425731. The next prime is 18425789. The reversal of 18425738 is 83752481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83752481 = 3691 ⋅22691.

It can be written as a sum of positive squares in only one way, i.e., 14235529 + 4190209 = 3773^2 + 2047^2 .

It is not an unprimeable number, because it can be changed into a prime (18425731) by changing a digit.

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 as a sum of consecutive naturals, namely, 4606433 + ... + 4606436.

Almost surely, 2^18425738 is an apocalyptic number.

18425738 is a deficient number, since it is larger than the sum of its proper divisors (9212872).

18425738 is an equidigital number, since it uses as much as digits as its factorization.

18425738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9212871.

The product of its digits is 53760, while the sum is 38.

The square root of 18425738 is about 4292.5211705943. The cubic root of 18425738 is about 264.1242623618.

The spelling of 18425738 in words is "eighteen million, four hundred twenty-five thousand, seven hundred thirty-eight".