1390238649 has 6 divisors (see below), whose sum is σ = 2008122506. Its totient is φ = 926825760.

The previous prime is 1390238623. The next prime is 1390238669. The reversal of 1390238649 is 9468320931.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1186320249 + 203918400 = 34443^2 + 14280^2 .

It is not a de Polignac number, because 1390238649 - 2⁹ = 1390238137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390238669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77235472 + ... + 77235489.

Almost surely, 2^1390238649 is an apocalyptic number.

It is an amenable number.

1390238649 is a deficient number, since it is larger than the sum of its proper divisors (617883857).

1390238649 is a wasteful number, since it uses less digits than its factorization.

1390238649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154470967 (or 154470964 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 1390238649 is about 37285.9041596151. The cubic root of 1390238649 is about 1116.0828960083.

The spelling of 1390238649 in words is "one billion, three hundred ninety million, two hundred thirty-eight thousand, six hundred forty-nine".