1438340865 has 16 divisors (see below), whose sum is σ = 2478372288. Its totient is φ = 708106176.

The previous prime is 1438340861. The next prime is 1438340873. The reversal of 1438340865 is 5680438341.

It is not a de Polignac number, because 1438340865 - 2² = 1438340861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1438340861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3687859 + ... + 3688248.

It is an arithmetic number, because the mean of its divisors is an integer number (154898268).

Almost surely, 2^1438340865 is an apocalyptic number.

1438340865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1438340865 is a deficient number, since it is larger than the sum of its proper divisors (1040031423).

1438340865 is a wasteful number, since it uses less digits than its factorization.

1438340865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7376128.

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 1438340865 is about 37925.4645983408. The cubic root of 1438340865 is about 1128.8093719268.

The spelling of 1438340865 in words is "one billion, four hundred thirty-eight million, three hundred forty thousand, eight hundred sixty-five".