1389842737 has 2 divisors, whose sum is σ = 1389842738. Its totient is φ = 1389842736.

The previous prime is 1389842717. The next prime is 1389842743. The reversal of 1389842737 is 7372489831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1262807296 + 127035441 = 35536^2 + 11271^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389842737 - 2²⁷ = 1255625009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1389842717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694921368 + 694921369.

It is an arithmetic number, because the mean of its divisors is an integer number (694921369).

Almost surely, 2^1389842737 is an apocalyptic number.

It is an amenable number.

1389842737 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389842737 is an equidigital number, since it uses as much as digits as its factorization.

1389842737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 52.

The square root of 1389842737 is about 37280.5946438626. The cubic root of 1389842737 is about 1115.9769399641.

The spelling of 1389842737 in words is "one billion, three hundred eighty-nine million, eight hundred forty-two thousand, seven hundred thirty-seven".