1390439 has 4 divisors (see below), whose sum is σ = 1463640. Its totient is φ = 1317240.

The previous prime is 1390421. The next prime is 1390457. The reversal of 1390439 is 9340931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9340931 = 587 ⋅15913.

It is an interprime number because it is at equal distance from previous prime (1390421) and next prime (1390457).

It is a cyclic number.

It is not a de Polignac number, because 1390439 - 2²⁰ = 341863 is a prime.

It is a super-2 number, since 2×1390439² = 3866641225442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390409) 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 3 ways as a sum of consecutive naturals, for example, 36572 + ... + 36609.

It is an arithmetic number, because the mean of its divisors is an integer number (365910).

2^1390439 is an apocalyptic number.

1390439 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1390439 is a deficient number, since it is larger than the sum of its proper divisors (73201).

1390439 is an equidigital number, since it uses as much as digits as its factorization.

1390439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73200.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 1390439 is about 1179.1687750276. The cubic root of 1390439 is about 111.6136507327.

The spelling of 1390439 in words is "one million, three hundred ninety thousand, four hundred thirty-nine".