1390841 has 2 divisors, whose sum is σ = 1390842. Its totient is φ = 1390840.

The previous prime is 1390813. The next prime is 1390847. The reversal of 1390841 is 1480931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1371241 + 19600 = 1171^2 + 140^2 .

It is an emirp because it is prime and its reverse (1480931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1390841 - 2¹⁸ = 1128697 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1390841.

It is not a weakly prime, because it can be changed into another prime (1390847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695420 + 695421.

It is an arithmetic number, because the mean of its divisors is an integer number (695421).

2^1390841 is an apocalyptic number.

It is an amenable number.

1390841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390841 is an equidigital number, since it uses as much as digits as its factorization.

1390841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1390841 is about 1179.3392217679. The cubic root of 1390841 is about 111.6244061762.

The spelling of 1390841 in words is "one million, three hundred ninety thousand, eight hundred forty-one".