18995407 has 4 divisors (see below), whose sum is σ = 19100536. Its totient is φ = 18890280.

The previous prime is 18995399. The next prime is 18995419. The reversal of 18995407 is 70459981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70459981 = 127 ⋅554803.

It is a cyclic number.

It is not a de Polignac number, because 18995407 - 2³ = 18995399 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 (18995437) 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 3 ways as a sum of consecutive naturals, for example, 52293 + ... + 52654.

It is an arithmetic number, because the mean of its divisors is an integer number (4775134).

Almost surely, 2^18995407 is an apocalyptic number.

18995407 is a deficient number, since it is larger than the sum of its proper divisors (105129).

18995407 is a wasteful number, since it uses less digits than its factorization.

18995407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105128.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 18995407 is about 4358.3720584640. The cubic root of 18995407 is about 266.8186614398.

The spelling of 18995407 in words is "eighteen million, nine hundred ninety-five thousand, four hundred seven".