1392309 has 10 divisors (see below), whose sum is σ = 2079990. Its totient is φ = 928152.

The previous prime is 1392277. The next prime is 1392311. The reversal of 1392309 is 9032931.

It can be written as a sum of positive squares in only one way, i.e., 1368900 + 23409 = 1170^2 + 153^2 .

It is not a de Polignac number, because 1392309 - 2⁵ = 1392277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

1392309 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1392379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8514 + ... + 8675.

It is an arithmetic number, because the mean of its divisors is an integer number (207999).

2^1392309 is an apocalyptic number.

It is an amenable number.

1392309 is a deficient number, since it is larger than the sum of its proper divisors (687681).

1392309 is an equidigital number, since it uses as much as digits as its factorization.

1392309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17201 (or 17192 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 1392309 is about 1179.9614400479. The cubic root of 1392309 is about 111.6636646801.

It can be divided in two parts, 1392 and 309, that multiplied together give a triangular number (430128 = T₉₂₇).

The spelling of 1392309 in words is "one million, three hundred ninety-two thousand, three hundred nine".