1390605 has 8 divisors (see below), whose sum is σ = 2224992. Its totient is φ = 741648.

The previous prime is 1390601. The next prime is 1390607. The reversal of 1390605 is 5060931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1390605 - 2² = 1390601 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 (1390601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46339 + ... + 46368.

It is an arithmetic number, because the mean of its divisors is an integer number (278124).

2^1390605 is an apocalyptic number.

1390605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1390605 is a deficient number, since it is larger than the sum of its proper divisors (834387).

1390605 is an equidigital number, since it uses as much as digits as its factorization.

1390605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92715.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 1390605 is about 1179.2391614935. The cubic root of 1390605 is about 111.6180922865.

The spelling of 1390605 in words is "one million, three hundred ninety thousand, six hundred five".