1389760391 has 2 divisors, whose sum is σ = 1389760392. Its totient is φ = 1389760390.

The previous prime is 1389760373. The next prime is 1389760423. The reversal of 1389760391 is 1930679831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1389760391 - 2²² = 1385566087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389760321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694880195 + 694880196.

It is an arithmetic number, because the mean of its divisors is an integer number (694880196).

Almost surely, 2^1389760391 is an apocalyptic number.

1389760391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389760391 is an equidigital number, since it uses as much as digits as its factorization.

1389760391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 1389760391 is about 37279.4902191540. The cubic root of 1389760391 is about 1115.9548995683.

The spelling of 1389760391 in words is "one billion, three hundred eighty-nine million, seven hundred sixty thousand, three hundred ninety-one".