18881995 has 8 divisors (see below), whose sum is σ = 24718320. Its totient is φ = 13732320.

The previous prime is 18881983. The next prime is 18881999. The reversal of 18881995 is 59918881.

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

It is not a de Polignac number, because 18881995 - 2⁵ = 18881963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18881999) 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 in 7 ways as a sum of consecutive naturals, for example, 171600 + ... + 171709.

It is an arithmetic number, because the mean of its divisors is an integer number (3089790).

Almost surely, 2^18881995 is an apocalyptic number.

18881995 is a deficient number, since it is larger than the sum of its proper divisors (5836325).

18881995 is a wasteful number, since it uses less digits than its factorization.

18881995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343325.

The product of its digits is 207360, while the sum is 49.

The square root of 18881995 is about 4345.3417587113. The cubic root of 18881995 is about 266.2865878731.

It can be divided in two parts, 1888 and 1995, that added together give a palindrome (3883).

The spelling of 18881995 in words is "eighteen million, eight hundred eighty-one thousand, nine hundred ninety-five".