1215328465 has 16 divisors (see below), whose sum is σ = 1571306688. Its totient is φ = 897057216.

The previous prime is 1215328427. The next prime is 1215328493. The reversal of 1215328465 is 5648235121.

It is a cyclic number.

It is not a de Polignac number, because 1215328465 - 2¹³ = 1215320273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259434 + ... + 264076.

It is an arithmetic number, because the mean of its divisors is an integer number (98206668).

Almost surely, 2^1215328465 is an apocalyptic number.

It is an amenable number.

1215328465 is a deficient number, since it is larger than the sum of its proper divisors (355978223).

1215328465 is a wasteful number, since it uses less digits than its factorization.

1215328465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8688.

The product of its digits is 57600, while the sum is 37.

The square root of 1215328465 is about 34861.5614251571. The cubic root of 1215328465 is about 1067.1641402930.

The spelling of 1215328465 in words is "one billion, two hundred fifteen million, three hundred twenty-eight thousand, four hundred sixty-five".