1438652681 has 4 divisors (see below), whose sum is σ = 1485060864. Its totient is φ = 1392244500.

The previous prime is 1438652653. The next prime is 1438652707. The reversal of 1438652681 is 1862568341.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1862568341 = 251 ⋅7420591.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1438652681 is a prime.

It is a super-2 number, since 2×1438652681² = 4139443073096975522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1438657681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23204045 + ... + 23204106.

It is an arithmetic number, because the mean of its divisors is an integer number (371265216).

Almost surely, 2^1438652681 is an apocalyptic number.

It is an amenable number.

1438652681 is a deficient number, since it is larger than the sum of its proper divisors (46408183).

1438652681 is an equidigital number, since it uses as much as digits as its factorization.

1438652681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46408182.

The product of its digits is 276480, while the sum is 44.

The square root of 1438652681 is about 37929.5752810389. The cubic root of 1438652681 is about 1128.8909370596.

The spelling of 1438652681 in words is "one billion, four hundred thirty-eight million, six hundred fifty-two thousand, six hundred eighty-one".