1288399432 has 32 divisors (see below), whose sum is σ = 2496913920. Its totient is φ = 622609920.

The previous prime is 1288399421. The next prime is 1288399439. The reversal of 1288399432 is 2349938821.

It is not an unprimeable number, because it can be changed into a prime (1288399439) 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, 217048 + ... + 222904.

It is an arithmetic number, because the mean of its divisors is an integer number (78028560).

Almost surely, 2^1288399432 is an apocalyptic number.

It is an amenable number.

1288399432 is a deficient number, since it is larger than the sum of its proper divisors (1208514488).

1288399432 is a wasteful number, since it uses less digits than its factorization.

1288399432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6781 (or 6777 counting only the distinct ones).

The product of its digits is 746496, while the sum is 49.

The square root of 1288399432 is about 35894.2813272532. The cubic root of 1288399432 is about 1088.1368254430.

The spelling of 1288399432 in words is "one billion, two hundred eighty-eight million, three hundred ninety-nine thousand, four hundred thirty-two".