18995390 has 16 divisors (see below), whose sum is σ = 34463232. Its totient is φ = 7537824.

The previous prime is 18995381. The next prime is 18995399. The reversal of 18995390 is 9359981.

It is an interprime number because it is at equal distance from previous prime (18995381) and next prime (18995399).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18995399) 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, 6209 + ... + 8748.

It is an arithmetic number, because the mean of its divisors is an integer number (2153952).

Almost surely, 2^18995390 is an apocalyptic number.

18995390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18995390 is a deficient number, since it is larger than the sum of its proper divisors (15467842).

18995390 is a wasteful number, since it uses less digits than its factorization.

18995390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15091.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 18995390 is about 4358.3701081941. The cubic root of 18995390 is about 266.8185818430.

The spelling of 18995390 in words is "eighteen million, nine hundred ninety-five thousand, three hundred ninety".