1439248681 has 8 divisors (see below), whose sum is σ = 1591851464. Its totient is φ = 1292630400.

The previous prime is 1439248669. The next prime is 1439248691. The reversal of 1439248681 is 1868429341.

It can be written as a sum of positive squares in 4 ways, for example, as 13808656 + 1425440025 = 3716^2 + 37755^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1439248681 - 2⁵ = 1439248649 is a prime.

It is a super-2 number, since 2×1439248681² = 4142873531520479522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1439248631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1495620 + ... + 1496581.

It is an arithmetic number, because the mean of its divisors is an integer number (198981433).

Almost surely, 2^1439248681 is an apocalyptic number.

It is an amenable number.

1439248681 is a deficient number, since it is larger than the sum of its proper divisors (152602783).

1439248681 is a wasteful number, since it uses less digits than its factorization.

1439248681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992251.

The product of its digits is 331776, while the sum is 46.

The square root of 1439248681 is about 37937.4311333807. The cubic root of 1439248681 is about 1129.0468065334.

The spelling of 1439248681 in words is "one billion, four hundred thirty-nine million, two hundred forty-eight thousand, six hundred eighty-one".