1340423405 has 16 divisors (see below), whose sum is σ = 1626531840. Its totient is φ = 1060379712.

The previous prime is 1340423387. The next prime is 1340423411. The reversal of 1340423405 is 5043240431.

It is a cyclic number.

It is not a de Polignac number, because 1340423405 - 2¹⁰ = 1340422381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197966 + ... + 204624.

It is an arithmetic number, because the mean of its divisors is an integer number (101658240).

Almost surely, 2^1340423405 is an apocalyptic number.

It is an amenable number.

1340423405 is a deficient number, since it is larger than the sum of its proper divisors (286108435).

1340423405 is a wasteful number, since it uses less digits than its factorization.

1340423405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7108.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 1340423405 is about 36611.7932502630. The cubic root of 1340423405 is about 1102.5898768604.

Adding to 1340423405 its reverse (5043240431), we get a palindrome (6383663836).

The spelling of 1340423405 in words is "one billion, three hundred forty million, four hundred twenty-three thousand, four hundred five".