840866001 has 4 divisors (see below), whose sum is σ = 1121154672. Its totient is φ = 560577332.

The previous prime is 840865997. The next prime is 840866009. The reversal of 840866001 is 100668048.

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 not a de Polignac number, because 840866001 - 2² = 840865997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840866009) 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, 140144331 + ... + 140144336.

It is an arithmetic number, because the mean of its divisors is an integer number (280288668).

Almost surely, 2^840866001 is an apocalyptic number.

It is an amenable number.

840866001 is a deficient number, since it is larger than the sum of its proper divisors (280288671).

840866001 is a wasteful number, since it uses less digits than its factorization.

840866001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280288670.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 840866001 is about 28997.6895803786. The cubic root of 840866001 is about 943.8629329293.

The spelling of 840866001 in words is "eight hundred forty million, eight hundred sixty-six thousand, one".