18948077 has 4 divisors (see below), whose sum is σ = 19143516. Its totient is φ = 18752640.

The previous prime is 18948043. The next prime is 18948089. The reversal of 18948077 is 77084981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77084981 = 1409 ⋅54709.

It can be written as a sum of positive squares in 2 ways, for example, as 4056196 + 14891881 = 2014^2 + 3859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18948077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18948277) 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, 97574 + ... + 97767.

It is an arithmetic number, because the mean of its divisors is an integer number (4785879).

Almost surely, 2^18948077 is an apocalyptic number.

It is an amenable number.

18948077 is a deficient number, since it is larger than the sum of its proper divisors (195439).

18948077 is an equidigital number, since it uses as much as digits as its factorization.

18948077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195438.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 18948077 is about 4352.9388922887. The cubic root of 18948077 is about 266.5968704487.

The spelling of 18948077 in words is "eighteen million, nine hundred forty-eight thousand, seventy-seven".