1396990949 has 2 divisors, whose sum is σ = 1396990950. Its totient is φ = 1396990948.

The previous prime is 1396990879. The next prime is 1396991003. The reversal of 1396990949 is 9490996931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 961434049 + 435556900 = 31007^2 + 20870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1396990949 is a prime.

It is a Sophie Germain 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 (1396960949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698495474 + 698495475.

It is an arithmetic number, because the mean of its divisors is an integer number (698495475).

Almost surely, 2^1396990949 is an apocalyptic number.

It is an amenable number.

1396990949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1396990949 is an equidigital number, since it uses as much as digits as its factorization.

1396990949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4251528, while the sum is 59.

The square root of 1396990949 is about 37376.3421029934. The cubic root of 1396990949 is about 1117.8868928812.

The spelling of 1396990949 in words is "one billion, three hundred ninety-six million, nine hundred ninety thousand, nine hundred forty-nine".