1288936380 has 24 divisors (see below), whose sum is σ = 3609022032. Its totient is φ = 343716352.

The previous prime is 1288936367. The next prime is 1288936391. The reversal of 1288936380 is 836398821.

It is a super-2 number, since 2×1288936380² = 3322713983375008800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10741077 + ... + 10741196.

It is an arithmetic number, because the mean of its divisors is an integer number (150375918).

Almost surely, 2^1288936380 is an apocalyptic number.

1288936380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1288936380 is an abundant number, since it is smaller than the sum of its proper divisors (2320085652).

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

1288936380 is a wasteful number, since it uses less digits than its factorization.

1288936380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21482285 (or 21482283 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 1288936380 is about 35901.7601239828. The cubic root of 1288936380 is about 1088.2879669110.

The spelling of 1288936380 in words is "one billion, two hundred eighty-eight million, nine hundred thirty-six thousand, three hundred eighty".