1390966394 has 4 divisors (see below), whose sum is σ = 2086449594. Its totient is φ = 695483196.

The previous prime is 1390966393. The next prime is 1390966403. The reversal of 1390966394 is 4936690931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1050084025 + 340882369 = 32405^2 + 18463^2 .

It is not an unprimeable number, because it can be changed into a prime (1390966393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347741597 + ... + 347741600.

Almost surely, 2^1390966394 is an apocalyptic number.

1390966394 is a deficient number, since it is larger than the sum of its proper divisors (695483200).

1390966394 is an equidigital number, since it uses as much as digits as its factorization.

1390966394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695483199.

The product of its (nonzero) digits is 944784, while the sum is 50.

The square root of 1390966394 is about 37295.6618656916. The cubic root of 1390966394 is about 1116.2776064787.

The spelling of 1390966394 in words is "one billion, three hundred ninety million, nine hundred sixty-six thousand, three hundred ninety-four".