1390305 has 16 divisors (see below), whose sum is σ = 2542464. Its totient is φ = 635520.

The previous prime is 1390297. The next prime is 1390309. The reversal of 1390305 is 5030931.

It is not a de Polignac number, because 1390305 - 2³ = 1390297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1390309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6516 + ... + 6725.

It is an arithmetic number, because the mean of its divisors is an integer number (158904).

2^1390305 is an apocalyptic number.

1390305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1390305 is a deficient number, since it is larger than the sum of its proper divisors (1152159).

1390305 is a wasteful number, since it uses less digits than its factorization.

1390305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13256.

The product of its (nonzero) digits is 405, while the sum is 21.

The square root of 1390305 is about 1179.1119539721. Note that the first 3 decimals coincide. The cubic root of 1390305 is about 111.6100651242.

The spelling of 1390305 in words is "one million, three hundred ninety thousand, three hundred five".