1288924993 has 4 divisors (see below), whose sum is σ = 1291796100. Its totient is φ = 1286053888.

The previous prime is 1288924979. The next prime is 1288924997. The reversal of 1288924993 is 3994298821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3994298821 = 13781 ⋅289841.

It can be written as a sum of positive squares in 2 ways, for example, as 963916209 + 325008784 = 31047^2 + 18028^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288924993 - 2⁵ = 1288924961 is a prime.

It is a super-2 number, since 2×1288924993² = 3322655275160100098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288924997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1434880 + ... + 1435777.

It is an arithmetic number, because the mean of its divisors is an integer number (322949025).

Almost surely, 2^1288924993 is an apocalyptic number.

It is an amenable number.

1288924993 is a deficient number, since it is larger than the sum of its proper divisors (2871107).

1288924993 is an equidigital number, since it uses as much as digits as its factorization.

1288924993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2871106.

The product of its digits is 2239488, while the sum is 55.

The square root of 1288924993 is about 35901.6015380930. The cubic root of 1288924993 is about 1088.2847621054.

The spelling of 1288924993 in words is "one billion, two hundred eighty-eight million, nine hundred twenty-four thousand, nine hundred ninety-three".