1340905 has 16 divisors (see below), whose sum is σ = 1709568. Its totient is φ = 1008000.

The previous prime is 1340903. The next prime is 1340929. The reversal of 1340905 is 5090431.

It is not a de Polignac number, because 1340905 - 2¹ = 1340903 is a prime.

It is a Duffinian number.

1340905 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6250 + ... + 6460.

It is an arithmetic number, because the mean of its divisors is an integer number (106848).

2^1340905 is an apocalyptic number.

It is an amenable number.

1340905 is a deficient number, since it is larger than the sum of its proper divisors (368663).

1340905 is a wasteful number, since it uses less digits than its factorization.

1340905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1340905 is about 1157.9745247630. The cubic root of 1340905 is about 110.2721909318.

The spelling of 1340905 in words is "one million, three hundred forty thousand, nine hundred five".