1378605 has 16 divisors (see below), whose sum is σ = 2237760. Its totient is φ = 724608.

The previous prime is 1378603. The next prime is 1378613. The reversal of 1378605 is 5068731.

It is not a de Polignac number, because 1378605 - 2¹ = 1378603 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378603) 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, 466 + ... + 1724.

It is an arithmetic number, because the mean of its divisors is an integer number (139860).

2^1378605 is an apocalyptic number.

1378605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1378605 is a deficient number, since it is larger than the sum of its proper divisors (859155).

1378605 is a wasteful number, since it uses less digits than its factorization.

1378605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 1378605 is about 1174.1401108897. The cubic root of 1378605 is about 111.2961009121.

The spelling of 1378605 in words is "one million, three hundred seventy-eight thousand, six hundred five".