1379865 has 16 divisors (see below), whose sum is σ = 2242368. Its totient is φ = 724416.

The previous prime is 1379857. The next prime is 1379867. The reversal of 1379865 is 5689731.

It is not a de Polignac number, because 1379865 - 2³ = 1379857 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1379867) 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, 319 + ... + 1691.

It is an arithmetic number, because the mean of its divisors is an integer number (140148).

2^1379865 is an apocalyptic number.

1379865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1379865 is a deficient number, since it is larger than the sum of its proper divisors (862503).

1379865 is a wasteful number, since it uses less digits than its factorization.

1379865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448.

The product of its digits is 45360, while the sum is 39.

The square root of 1379865 is about 1174.6765512259. The cubic root of 1379865 is about 111.3299975893.

The spelling of 1379865 in words is "one million, three hundred seventy-nine thousand, eight hundred sixty-five".