1288121926 has 64 divisors (see below), whose sum is σ = 2529128448. Its totient is φ = 477485568.

The previous prime is 1288121899. The next prime is 1288121927. The reversal of 1288121926 is 6291218821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288121927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 812931 + ... + 814513.

It is an arithmetic number, because the mean of its divisors is an integer number (39517632).

Almost surely, 2^1288121926 is an apocalyptic number.

1288121926 is a deficient number, since it is larger than the sum of its proper divisors (1241006522).

1288121926 is a wasteful number, since it uses less digits than its factorization.

1288121926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885.

The product of its digits is 27648, while the sum is 40.

The square root of 1288121926 is about 35890.4155172380. The cubic root of 1288121926 is about 1088.0586958990.

The spelling of 1288121926 in words is "one billion, two hundred eighty-eight million, one hundred twenty-one thousand, nine hundred twenty-six".