1438028865 has 96 divisors (see below), whose sum is σ = 3151040256. Its totient is φ = 590353920.

The previous prime is 1438028849. The next prime is 1438028903. The reversal of 1438028865 is 5688208341.

It is not a de Polignac number, because 1438028865 - 2⁴ = 1438028849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1438028865.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 146770 + ... + 156260.

It is an arithmetic number, because the mean of its divisors is an integer number (32823336).

Almost surely, 2^1438028865 is an apocalyptic number.

1438028865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1438028865 is an abundant number, since it is smaller than the sum of its proper divisors (1713011391).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1438028865 is a wasteful number, since it uses less digits than its factorization.

1438028865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9559 (or 9556 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The square root of 1438028865 is about 37921.3510439699. The cubic root of 1438028865 is about 1128.7277468636.

The spelling of 1438028865 in words is "one billion, four hundred thirty-eight million, twenty-eight thousand, eight hundred sixty-five".