1340405663 has 8 divisors (see below), whose sum is σ = 1359912960. Its totient is φ = 1320915960.

The previous prime is 1340405657. The next prime is 1340405701. The reversal of 1340405663 is 3665040431.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340405663 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 (1343405663) 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, 279278 + ... + 284036.

It is an arithmetic number, because the mean of its divisors is an integer number (169989120).

Almost surely, 2^1340405663 is an apocalyptic number.

1340405663 is a deficient number, since it is larger than the sum of its proper divisors (19507297).

1340405663 is an equidigital number, since it uses as much as digits as its factorization.

1340405663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8797.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 1340405663 is about 36611.5509504856. The cubic root of 1340405663 is about 1102.5850121697.

The spelling of 1340405663 in words is "one billion, three hundred forty million, four hundred five thousand, six hundred sixty-three".