1288145823 has 8 divisors (see below), whose sum is σ = 1717865088. Its totient is φ = 858595224.

The previous prime is 1288145813. The next prime is 1288145827. The reversal of 1288145823 is 3285418821.

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

It is not a de Polignac number, because 1288145823 - 2⁹ = 1288145311 is a prime.

It is a super-2 number, since 2×1288145823² = 3318639322624694658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288145827) 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, 23115 + ... + 55772.

It is an arithmetic number, because the mean of its divisors is an integer number (214733136).

Almost surely, 2^1288145823 is an apocalyptic number.

1288145823 is a deficient number, since it is larger than the sum of its proper divisors (429719265).

1288145823 is an equidigital number, since it uses as much as digits as its factorization.

1288145823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84333.

The product of its digits is 122880, while the sum is 42.

The square root of 1288145823 is about 35890.7484318731. The cubic root of 1288145823 is about 1088.0654243453.

The spelling of 1288145823 in words is "one billion, two hundred eighty-eight million, one hundred forty-five thousand, eight hundred twenty-three".