1296195870 has 64 divisors (see below), whose sum is σ = 3286001664. Its totient is φ = 326712960.

The previous prime is 1296195863. The next prime is 1296195871. The reversal of 1296195870 is 785916921.

It is a super-3 number, since 3×1296195870³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296195871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23784 + ... + 56196.

It is an arithmetic number, because the mean of its divisors is an integer number (51343776).

Almost surely, 2^1296195870 is an apocalyptic number.

1296195870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1296195870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1643000832).

1296195870 is an abundant number, since it is smaller than the sum of its proper divisors (1989805794).

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

1296195870 is a wasteful number, since it uses less digits than its factorization.

1296195870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32497.

The product of its (nonzero) digits is 272160, while the sum is 48.

The square root of 1296195870 is about 36002.7203138874. The cubic root of 1296195870 is about 1090.3272787674.

The spelling of 1296195870 in words is "one billion, two hundred ninety-six million, one hundred ninety-five thousand, eight hundred seventy".