840138201 has 24 divisors (see below), whose sum is σ = 1403613120. Its totient is φ = 474291936.

The previous prime is 840138193. The next prime is 840138203. The reversal of 840138201 is 102831048.

It is not a de Polignac number, because 840138201 - 2³ = 840138193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840138203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75106 + ... + 85563.

It is an arithmetic number, because the mean of its divisors is an integer number (58483880).

Almost surely, 2^840138201 is an apocalyptic number.

It is an amenable number.

840138201 is a deficient number, since it is larger than the sum of its proper divisors (563474919).

840138201 is a wasteful number, since it uses less digits than its factorization.

840138201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160765 (or 160762 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 840138201 is about 28985.1375880812. The cubic root of 840138201 is about 943.5905384659.

Adding to 840138201 its reverse (102831048), we get a palindrome (942969249).

The spelling of 840138201 in words is "eight hundred forty million, one hundred thirty-eight thousand, two hundred one".