1296218887 has 8 divisors (see below), whose sum is σ = 1343661840. Its totient is φ = 1248959040.

The previous prime is 1296218831. The next prime is 1296218899. The reversal of 1296218887 is 7888126921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1296218887 - 2¹⁹ = 1295694599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296218087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31278 + ... + 59755.

It is an arithmetic number, because the mean of its divisors is an integer number (167957730).

Almost surely, 2^1296218887 is an apocalyptic number.

1296218887 is a deficient number, since it is larger than the sum of its proper divisors (47442953).

1296218887 is an equidigital number, since it uses as much as digits as its factorization.

1296218887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91553.

The product of its digits is 774144, while the sum is 52.

The square root of 1296218887 is about 36003.0399688693. The cubic root of 1296218887 is about 1090.3337325025. Note that the first 3 decimals are identical.

The spelling of 1296218887 in words is "one billion, two hundred ninety-six million, two hundred eighteen thousand, eight hundred eighty-seven".