840878201 has 4 divisors (see below), whose sum is σ = 860433552. Its totient is φ = 821322852.

The previous prime is 840878119. The next prime is 840878237. The reversal of 840878201 is 102878048.

It is a happy number.

840878201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840878201 is a prime.

It is a super-2 number, since 2×840878201² = 1414152297833992802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840878261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9777611 + ... + 9777696.

It is an arithmetic number, because the mean of its divisors is an integer number (215108388).

Almost surely, 2^840878201 is an apocalyptic number.

It is an amenable number.

840878201 is a deficient number, since it is larger than the sum of its proper divisors (19555351).

840878201 is a wasteful number, since it uses less digits than its factorization.

840878201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19555350.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 840878201 is about 28997.8999412026. The cubic root of 840878201 is about 943.8674976963.

The spelling of 840878201 in words is "eight hundred forty million, eight hundred seventy-eight thousand, two hundred one".