18625949 has 8 divisors (see below), whose sum is σ = 19043640. Its totient is φ = 18210816.

The previous prime is 18625939. The next prime is 18625951. The reversal of 18625949 is 94952681.

It can be written as a sum of positive squares in 4 ways, for example, as 6943225 + 11682724 = 2635^2 + 3418^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18625949 - 2¹² = 18621853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18625939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23837 + ... + 24605.

It is an arithmetic number, because the mean of its divisors is an integer number (2380455).

Almost surely, 2^18625949 is an apocalyptic number.

It is an amenable number.

18625949 is a deficient number, since it is larger than the sum of its proper divisors (417691).

18625949 is an equidigital number, since it uses as much as digits as its factorization.

18625949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279.

The product of its digits is 155520, while the sum is 44.

The square root of 18625949 is about 4315.7790721954. The cubic root of 18625949 is about 265.0774616319.

The spelling of 18625949 in words is "eighteen million, six hundred twenty-five thousand, nine hundred forty-nine".