1291402867 has 8 divisors (see below), whose sum is σ = 1346262912. Its totient is φ = 1237368000.

The previous prime is 1291402859. The next prime is 1291402891. The reversal of 1291402867 is 7682041921.

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 1291402867 - 2³ = 1291402859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291402837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203098 + ... + 209359.

It is an arithmetic number, because the mean of its divisors is an integer number (168282864).

Almost surely, 2^1291402867 is an apocalyptic number.

1291402867 is a deficient number, since it is larger than the sum of its proper divisors (54860045).

1291402867 is a wasteful number, since it uses less digits than its factorization.

1291402867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412589.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1291402867 is about 35936.0942090261. The cubic root of 1291402867 is about 1088.9817011156.

The spelling of 1291402867 in words is "one billion, two hundred ninety-one million, four hundred two thousand, eight hundred sixty-seven".