1345905 has 24 divisors (see below), whose sum is σ = 2545920. Its totient is φ = 652320.

The previous prime is 1345889. The next prime is 1345913. The reversal of 1345905 is 5095431.

It is not a de Polignac number, because 1345905 - 2⁴ = 1345889 is a prime.

It is a super-2 number, since 2×1345905² = 3622920538050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 865 + ... + 1854.

It is an arithmetic number, because the mean of its divisors is an integer number (106080).

2^1345905 is an apocalyptic number.

1345905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1345905 is a deficient number, since it is larger than the sum of its proper divisors (1200015).

1345905 is a wasteful number, since it uses less digits than its factorization.

1345905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2741 (or 2738 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 1345905 is about 1160.1314580684. The cubic root of 1345905 is about 110.4090828223.

The spelling of 1345905 in words is "one million, three hundred forty-five thousand, nine hundred five".