1389890741 has 2 divisors, whose sum is σ = 1389890742. Its totient is φ = 1389890740.

The previous prime is 1389890737. The next prime is 1389890753. The reversal of 1389890741 is 1470989831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 915304516 + 474586225 = 30254^2 + 21785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389890741 - 2² = 1389890737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1389890741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389890701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694945370 + 694945371.

It is an arithmetic number, because the mean of its divisors is an integer number (694945371).

Almost surely, 2^1389890741 is an apocalyptic number.

It is an amenable number.

1389890741 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389890741 is an equidigital number, since it uses as much as digits as its factorization.

1389890741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 1389890741 is about 37281.2384585062. The cubic root of 1389890741 is about 1115.9897881180.

The spelling of 1389890741 in words is "one billion, three hundred eighty-nine million, eight hundred ninety thousand, seven hundred forty-one".