1288950138 has 64 divisors (see below), whose sum is σ = 3277290240. Its totient is φ = 367848000.

The previous prime is 1288950133. The next prime is 1288950151. The reversal of 1288950138 is 8310598821.

It is a happy number.

It is a super-2 number, since 2×1288950138² = 3322784916500438088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1288950093 and 1288950102.

It is not an unprimeable number, because it can be changed into a prime (1288950133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 490468 + ... + 493088.

It is an arithmetic number, because the mean of its divisors is an integer number (51207660).

Almost surely, 2^1288950138 is an apocalyptic number.

1288950138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1288950138 is an abundant number, since it is smaller than the sum of its proper divisors (1988340102).

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

1288950138 is a wasteful number, since it uses less digits than its factorization.

1288950138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940 (or 3934 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 1288950138 is about 35901.9517296762. The cubic root of 1288950138 is about 1088.2918389957.

The spelling of 1288950138 in words is "one billion, two hundred eighty-eight million, nine hundred fifty thousand, one hundred thirty-eight".