1393938641 has 2 divisors, whose sum is σ = 1393938642. Its totient is φ = 1393938640.

The previous prime is 1393938619. The next prime is 1393938659. The reversal of 1393938641 is 1468393931.

1393938641 is nontrivially palindromic in base 8.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1392857041 + 1081600 = 37321^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 1393938641 - 2¹⁸ = 1393676497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1393938691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696969320 + 696969321.

It is an arithmetic number, because the mean of its divisors is an integer number (696969321).

Almost surely, 2^1393938641 is an apocalyptic number.

It is an amenable number.

1393938641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393938641 is an equidigital number, since it uses as much as digits as its factorization.

1393938641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 47.

The square root of 1393938641 is about 37335.4876893285. The cubic root of 1393938641 is about 1117.0721361820.

The spelling of 1393938641 in words is "one billion, three hundred ninety-three million, nine hundred thirty-eight thousand, six hundred forty-one".