1438985377 has 2 divisors, whose sum is σ = 1438985378. Its totient is φ = 1438985376.

The previous prime is 1438985371. The next prime is 1438985447. The reversal of 1438985377 is 7735898341.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1411955776 + 27029601 = 37576^2 + 5199^2 .

It is an emirp because it is prime and its reverse (7735898341) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1438985377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1438985371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719492688 + 719492689.

It is an arithmetic number, because the mean of its divisors is an integer number (719492689).

Almost surely, 2^1438985377 is an apocalyptic number.

It is an amenable number.

1438985377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438985377 is an equidigital number, since it uses as much as digits as its factorization.

1438985377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 55.

The square root of 1438985377 is about 37933.9607344132. The cubic root of 1438985377 is about 1128.9779510083.

The spelling of 1438985377 in words is "one billion, four hundred thirty-eight million, nine hundred eighty-five thousand, three hundred seventy-seven".