1378001 has 2 divisors, whose sum is σ = 1378002. Its totient is φ = 1378000.

The previous prime is 1377983. The next prime is 1378007. The reversal of 1378001 is 1008731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 739600 + 638401 = 860^2 + 799^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378001 - 2¹⁸ = 1115857 is a prime.

It is equal to p₁₀₅₅₃₆ and since 1378001 and 105536 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1378007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689000 + 689001.

It is an arithmetic number, because the mean of its divisors is an integer number (689001).

2^1378001 is an apocalyptic number.

It is an amenable number.

1378001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378001 is an equidigital number, since it uses as much as digits as its factorization.

1378001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 1378001 is about 1173.8828732033. The cubic root of 1378001 is about 111.2798447051.

The spelling of 1378001 in words is "one million, three hundred seventy-eight thousand, one".