1288684392 has 32 divisors (see below), whose sum is σ = 3230858880. Its totient is φ = 428341760.

The previous prime is 1288684387. The next prime is 1288684393. The reversal of 1288684392 is 2934868821.

It is not an unprimeable number, because it can be changed into a prime (1288684393) 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, 67584 + ... + 84527.

It is an arithmetic number, because the mean of its divisors is an integer number (100964340).

Almost surely, 2^1288684392 is an apocalyptic number.

1288684392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1288684392 is an abundant number, since it is smaller than the sum of its proper divisors (1942174488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1288684392 is a wasteful number, since it uses less digits than its factorization.

1288684392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152473 (or 152469 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 51.

The square root of 1288684392 is about 35898.2505423314. The cubic root of 1288684392 is about 1088.2170419257.

The spelling of 1288684392 in words is "one billion, two hundred eighty-eight million, six hundred eighty-four thousand, three hundred ninety-two".