1398135887 has 2 divisors, whose sum is σ = 1398135888. Its totient is φ = 1398135886.

The previous prime is 1398135863. The next prime is 1398135953. The reversal of 1398135887 is 7885318931.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1398135887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1398135847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699067943 + 699067944.

It is an arithmetic number, because the mean of its divisors is an integer number (699067944).

Almost surely, 2^1398135887 is an apocalyptic number.

1398135887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398135887 is an equidigital number, since it uses as much as digits as its factorization.

1398135887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 53.

The square root of 1398135887 is about 37391.6553123822. The cubic root of 1398135887 is about 1118.1922066421.

The spelling of 1398135887 in words is "one billion, three hundred ninety-eight million, one hundred thirty-five thousand, eight hundred eighty-seven".