1438880557 has 2 divisors, whose sum is σ = 1438880558. Its totient is φ = 1438880556.

The previous prime is 1438880539. The next prime is 1438880567. The reversal of 1438880557 is 7550888341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1321613316 + 117267241 = 36354^2 + 10829^2 .

It is an emirp because it is prime and its reverse (7550888341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1438880557 - 2²³ = 1430491949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1438880557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1438880537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719440278 + 719440279.

It is an arithmetic number, because the mean of its divisors is an integer number (719440279).

Almost surely, 2^1438880557 is an apocalyptic number.

It is an amenable number.

1438880557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438880557 is an equidigital number, since it uses as much as digits as its factorization.

1438880557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1075200, while the sum is 49.

The square root of 1438880557 is about 37932.5790976569. The cubic root of 1438880557 is about 1128.9505376321.

The spelling of 1438880557 in words is "one billion, four hundred thirty-eight million, eight hundred eighty thousand, five hundred fifty-seven".