1288995465 has 16 divisors (see below), whose sum is σ = 2064384000. Its totient is φ = 686800512.

The previous prime is 1288995443. The next prime is 1288995467. The reversal of 1288995465 is 5645998821.

It is a happy number.

It is not a de Polignac number, because 1288995465 - 2¹⁷ = 1288864393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1288995467) 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, 25225 + ... + 56694.

It is an arithmetic number, because the mean of its divisors is an integer number (129024000).

Almost surely, 2^1288995465 is an apocalyptic number.

1288995465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1288995465 is a deficient number, since it is larger than the sum of its proper divisors (775388535).

1288995465 is a wasteful number, since it uses less digits than its factorization.

1288995465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82976.

The product of its digits is 6220800, while the sum is 57.

The square root of 1288995465 is about 35902.5829850723. The cubic root of 1288995465 is about 1088.3045957410.

The spelling of 1288995465 in words is "one billion, two hundred eighty-eight million, nine hundred ninety-five thousand, four hundred sixty-five".