1898395138 has 8 divisors (see below), whose sum is σ = 2850044688. Its totient is φ = 948380244.

The previous prime is 1898395133. The next prime is 1898395157. The reversal of 1898395138 is 8315938981.

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

It is not an unprimeable number, because it can be changed into a prime (1898395133) 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, 405756 + ... + 410407.

It is an arithmetic number, because the mean of its divisors is an integer number (356255586).

Almost surely, 2^1898395138 is an apocalyptic number.

1898395138 is a deficient number, since it is larger than the sum of its proper divisors (951649550).

1898395138 is a wasteful number, since it uses less digits than its factorization.

1898395138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817328.

The product of its digits is 1866240, while the sum is 55.

The square root of 1898395138 is about 43570.5765167274. The cubic root of 1898395138 is about 1238.2135083087.

The spelling of 1898395138 in words is "one billion, eight hundred ninety-eight million, three hundred ninety-five thousand, one hundred thirty-eight".