1390901 has 2 divisors, whose sum is σ = 1390902. Its totient is φ = 1390900.

The previous prime is 1390891. The next prime is 1390903. The reversal of 1390901 is 1090931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 948676 + 442225 = 974^2 + 665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390901 - 2¹⁰ = 1389877 is a prime.

It is a Sophie Germain prime.

Together with 1390903, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1390903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695450 + 695451.

It is an arithmetic number, because the mean of its divisors is an integer number (695451).

2^1390901 is an apocalyptic number.

It is an amenable number.

1390901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390901 is an equidigital number, since it uses as much as digits as its factorization.

1390901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 1390901 is about 1179.3646594671. The cubic root of 1390901 is about 111.6260112885.

The spelling of 1390901 in words is "one million, three hundred ninety thousand, nine hundred one".