1385401709 has 2 divisors, whose sum is σ = 1385401710. Its totient is φ = 1385401708.

The previous prime is 1385401651. The next prime is 1385401727. The reversal of 1385401709 is 9071045831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1072890025 + 312511684 = 32755^2 + 17678^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385401709 - 2⁸ = 1385401453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1385401729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692700854 + 692700855.

It is an arithmetic number, because the mean of its divisors is an integer number (692700855).

Almost surely, 2^1385401709 is an apocalyptic number.

It is an amenable number.

1385401709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385401709 is an equidigital number, since it uses as much as digits as its factorization.

1385401709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 1385401709 is about 37220.9847935274. The cubic root of 1385401709 is about 1114.7870276337.

The spelling of 1385401709 in words is "one billion, three hundred eighty-five million, four hundred one thousand, seven hundred nine".