840078001 has 16 divisors (see below), whose sum is σ = 1037318400. Its totient is φ = 677705280.

The previous prime is 840077993. The next prime is 840078017. The reversal of 840078001 is 100870048.

It is not a de Polignac number, because 840078001 - 2³ = 840077993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840078091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66205 + ... + 77866.

It is an arithmetic number, because the mean of its divisors is an integer number (64832400).

Almost surely, 2^840078001 is an apocalyptic number.

It is an amenable number.

840078001 is a deficient number, since it is larger than the sum of its proper divisors (197240399).

840078001 is a wasteful number, since it uses less digits than its factorization.

840078001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144109 (or 144095 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 840078001 is about 28984.0991062341. The cubic root of 840078001 is about 943.5680003061.

The spelling of 840078001 in words is "eight hundred forty million, seventy-eight thousand, one".