1340551405 has 8 divisors (see below), whose sum is σ = 1703288952. Its totient is φ = 1009356288.

The previous prime is 1340551397. The next prime is 1340551409. The reversal of 1340551405 is 5041550431.

It can be written as a sum of positive squares in 4 ways, for example, as 12823561 + 1327727844 = 3581^2 + 36438^2 .

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 1340551405 - 2³ = 1340551397 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 (1340551409) 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, 7885512 + ... + 7885681.

It is an arithmetic number, because the mean of its divisors is an integer number (212911119).

Almost surely, 2^1340551405 is an apocalyptic number.

It is an amenable number.

1340551405 is a deficient number, since it is larger than the sum of its proper divisors (362737547).

1340551405 is a wasteful number, since it uses less digits than its factorization.

1340551405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15771215.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1340551405 is about 36613.5412791497. The cubic root of 1340551405 is about 1102.6249719932.

It can be divided in two parts, 134055 and 1405, that added together give a triangular number (135460 = T₅₂₀).

The spelling of 1340551405 in words is "one billion, three hundred forty million, five hundred fifty-one thousand, four hundred five".