1278001 has 8 divisors (see below), whose sum is σ = 1336320. Its totient is φ = 1220688.

The previous prime is 1277993. The next prime is 1278007. The reversal of 1278001 is 1008721.

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

It is a cyclic number.

It is not a de Polignac number, because 1278001 - 2³ = 1277993 is a prime.

1278001 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1278001.

It is not an unprimeable number, because it can be changed into a prime (1278007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3510 + ... + 3856.

It is an arithmetic number, because the mean of its divisors is an integer number (167040).

2^1278001 is an apocalyptic number.

It is an amenable number.

1278001 is a deficient number, since it is larger than the sum of its proper divisors (58319).

1278001 is a wasteful number, since it uses less digits than its factorization.

1278001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 1278001 is about 1130.4870631723. The cubic root of 1278001 is about 108.5201531225.

It can be divided in two parts, 127 and 8001, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 1278001 in words is "one million, two hundred seventy-eight thousand, one".