1438134989 has 2 divisors, whose sum is σ = 1438134990. Its totient is φ = 1438134988.

The previous prime is 1438134959. The next prime is 1438135051. The reversal of 1438134989 is 9894318341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 904986889 + 533148100 = 30083^2 + 23090^2 .

It is an emirp because it is prime and its reverse (9894318341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1438134989 - 2¹² = 1438130893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1438134959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719067494 + 719067495.

It is an arithmetic number, because the mean of its divisors is an integer number (719067495).

Almost surely, 2^1438134989 is an apocalyptic number.

It is an amenable number.

1438134989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438134989 is an equidigital number, since it uses as much as digits as its factorization.

1438134989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 50.

The square root of 1438134989 is about 37922.7502826470. The cubic root of 1438134989 is about 1128.7555122211.

The spelling of 1438134989 in words is "one billion, four hundred thirty-eight million, one hundred thirty-four thousand, nine hundred eighty-nine".