1438521697 has 8 divisors (see below), whose sum is σ = 1444279680. Its totient is φ = 1432772880.

The previous prime is 1438521677. The next prime is 1438521701. The reversal of 1438521697 is 7961258341.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1438521697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1438521607) 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, 564408 + ... + 566950.

It is an arithmetic number, because the mean of its divisors is an integer number (180534960).

Almost surely, 2^1438521697 is an apocalyptic number.

It is an amenable number.

1438521697 is a deficient number, since it is larger than the sum of its proper divisors (5757983).

1438521697 is a wasteful number, since it uses less digits than its factorization.

1438521697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4583.

The product of its digits is 362880, while the sum is 46.

The square root of 1438521697 is about 37927.8485680377. The cubic root of 1438521697 is about 1128.8566755731.

The spelling of 1438521697 in words is "one billion, four hundred thirty-eight million, five hundred twenty-one thousand, six hundred ninety-seven".