1392805 has 4 divisors (see below), whose sum is σ = 1671372. Its totient is φ = 1114240.

The previous prime is 1392803. The next prime is 1392817. The reversal of 1392805 is 5082931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 690561 + 702244 = 831^2 + 838^2 .

It is not a de Polignac number, because 1392805 - 2¹ = 1392803 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1392803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139276 + ... + 139285.

It is an arithmetic number, because the mean of its divisors is an integer number (417843).

2^1392805 is an apocalyptic number.

It is an amenable number.

1392805 is a deficient number, since it is larger than the sum of its proper divisors (278567).

1392805 is an equidigital number, since it uses as much as digits as its factorization.

1392805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278566.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1392805 is about 1180.1715976925. The cubic root of 1392805 is about 111.6769228965.

It can be divided in two parts, 1392 and 805, that added together give a cube (2197 = 13³).

The spelling of 1392805 in words is "one million, three hundred ninety-two thousand, eight hundred five".