1389130187 has 2 divisors, whose sum is σ = 1389130188. Its totient is φ = 1389130186.

The previous prime is 1389130139. The next prime is 1389130283. The reversal of 1389130187 is 7810319831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1389130187 - 2²² = 1384935883 is a prime.

It is not a weakly prime, because it can be changed into another prime (1389130487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694565093 + 694565094.

It is an arithmetic number, because the mean of its divisors is an integer number (694565094).

Almost surely, 2^1389130187 is an apocalyptic number.

1389130187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389130187 is an equidigital number, since it uses as much as digits as its factorization.

1389130187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1389130187 is about 37271.0368382743. The cubic root of 1389130187 is about 1115.7861928913.

The spelling of 1389130187 in words is "one billion, three hundred eighty-nine million, one hundred thirty thousand, one hundred eighty-seven".