1368449921 has 8 divisors (see below), whose sum is σ = 1407518784. Its totient is φ = 1329490800.

The previous prime is 1368449911. The next prime is 1368449923. The reversal of 1368449921 is 1299448631.

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 1368449921 - 2²² = 1364255617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1368449923) 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, 1805 + ... + 52346.

It is an arithmetic number, because the mean of its divisors is an integer number (175939848).

Almost surely, 2^1368449921 is an apocalyptic number.

It is an amenable number.

1368449921 is a deficient number, since it is larger than the sum of its proper divisors (39068863).

1368449921 is an equidigital number, since it uses as much as digits as its factorization.

1368449921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54871.

The product of its digits is 373248, while the sum is 47.

The square root of 1368449921 is about 36992.5657531348. The cubic root of 1368449921 is about 1110.2215073455.

The spelling of 1368449921 in words is "one billion, three hundred sixty-eight million, four hundred forty-nine thousand, nine hundred twenty-one".