1390905349 has 2 divisors, whose sum is σ = 1390905350. Its totient is φ = 1390905348.

The previous prime is 1390905311. The next prime is 1390905377. The reversal of 1390905349 is 9435090931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1153960900 + 236944449 = 33970^2 + 15393^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390905349 - 2¹⁹ = 1390381061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1390905379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695452674 + 695452675.

It is an arithmetic number, because the mean of its divisors is an integer number (695452675).

Almost surely, 2^1390905349 is an apocalyptic number.

It is an amenable number.

1390905349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390905349 is an equidigital number, since it uses as much as digits as its factorization.

1390905349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 1390905349 is about 37294.8434639428. The cubic root of 1390905349 is about 1116.2612763063.

The spelling of 1390905349 in words is "one billion, three hundred ninety million, nine hundred five thousand, three hundred forty-nine".