1378905 has 32 divisors (see below), whose sum is σ = 2464128. Its totient is φ = 652800.

The previous prime is 1378903. The next prime is 1378907. The reversal of 1378905 is 5098731.

It is an interprime number because it is at equal distance from previous prime (1378903) and next prime (1378907).

It is not a de Polignac number, because 1378905 - 2¹ = 1378903 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

1378905 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378903) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9997 + ... + 10133.

It is an arithmetic number, because the mean of its divisors is an integer number (77004).

2^1378905 is an apocalyptic number.

1378905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1378905 is a deficient number, since it is larger than the sum of its proper divisors (1085223).

1378905 is a wasteful number, since it uses less digits than its factorization.

1378905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 1378905 is about 1174.2678570071. The cubic root of 1378905 is about 111.3041734223.

The spelling of 1378905 in words is "one million, three hundred seventy-eight thousand, nine hundred five".