210138945 has 8 divisors (see below), whose sum is σ = 336222336. Its totient is φ = 112074096.

The previous prime is 210138937. The next prime is 210138977. The reversal of 210138945 is 549831012.

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

It is not a de Polignac number, because 210138945 - 2³ = 210138937 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 7004617 + ... + 7004646.

It is an arithmetic number, because the mean of its divisors is an integer number (42027792).

Almost surely, 2^210138945 is an apocalyptic number.

It is an amenable number.

210138945 is a deficient number, since it is larger than the sum of its proper divisors (126083391).

210138945 is a wasteful number, since it uses less digits than its factorization.

210138945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14009271.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 210138945 is about 14496.1700114203. The cubic root of 210138945 is about 594.5232581584.

Adding to 210138945 its reverse (549831012), we get a palindrome (759969957).

The spelling of 210138945 in words is "two hundred ten million, one hundred thirty-eight thousand, nine hundred forty-five".