1368856891 has 8 divisors (see below), whose sum is σ = 1437962400. Its totient is φ = 1300550592.

The previous prime is 1368856861. The next prime is 1368856901. The reversal of 1368856891 is 1986588631.

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 1368856891 - 2⁷ = 1368856763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1368856831) 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, 196290 + ... + 203143.

It is an arithmetic number, because the mean of its divisors is an integer number (179745300).

Almost surely, 2^1368856891 is an apocalyptic number.

1368856891 is a deficient number, since it is larger than the sum of its proper divisors (69105509).

1368856891 is a wasteful number, since it uses less digits than its factorization.

1368856891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399605.

The product of its digits is 2488320, while the sum is 55.

The square root of 1368856891 is about 36998.0660440515. The cubic root of 1368856891 is about 1110.3315545010.

The spelling of 1368856891 in words is "one billion, three hundred sixty-eight million, eight hundred fifty-six thousand, eight hundred ninety-one".