1296989408 has 192 divisors, whose sum is σ = 3186376704. Its totient is φ = 511488000.

The previous prime is 1296989363. The next prime is 1296989413. The reversal of 1296989408 is 8049896921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5815985 + ... + 5816207.

It is an arithmetic number, because the mean of its divisors is an integer number (16595712).

Almost surely, 2^1296989408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1296989408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1593188352).

1296989408 is an abundant number, since it is smaller than the sum of its proper divisors (1889387296).

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

1296989408 is a wasteful number, since it uses less digits than its factorization.

1296989408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 56.

The square root of 1296989408 is about 36013.7391560499. The cubic root of 1296989408 is about 1090.5497347621.

The spelling of 1296989408 in words is "one billion, two hundred ninety-six million, nine hundred eighty-nine thousand, four hundred eight".