1438093681 has 2 divisors, whose sum is σ = 1438093682. Its totient is φ = 1438093680.

The previous prime is 1438093577. The next prime is 1438093691. The reversal of 1438093681 is 1863908341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1437926400 + 167281 = 37920^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438093681 - 2¹³ = 1438085489 is a prime.

It is a super-2 number, since 2×1438093681² = 4136226870664259522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1438093691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719046840 + 719046841.

It is an arithmetic number, because the mean of its divisors is an integer number (719046841).

Almost surely, 2^1438093681 is an apocalyptic number.

It is an amenable number.

1438093681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438093681 is an equidigital number, since it uses as much as digits as its factorization.

1438093681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 1438093681 is about 37922.2056452417. The cubic root of 1438093681 is about 1128.7447049187.

The spelling of 1438093681 in words is "one billion, four hundred thirty-eight million, ninety-three thousand, six hundred eighty-one".