1423709 has 4 divisors (see below), whose sum is σ = 1627104. Its totient is φ = 1220316.

The previous prime is 1423703. The next prime is 1423711. The reversal of 1423709 is 9073241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9073241 = 19 ⋅477539.

It is a cyclic number.

It is not a de Polignac number, because 1423709 - 2⁸ = 1423453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423703) 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, 101687 + ... + 101700.

It is an arithmetic number, because the mean of its divisors is an integer number (406776).

2^1423709 is an apocalyptic number.

It is an amenable number.

1423709 is a deficient number, since it is larger than the sum of its proper divisors (203395).

1423709 is an equidigital number, since it uses as much as digits as its factorization.

1423709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203394.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 1423709 is about 1193.1927757073. The cubic root of 1423709 is about 112.4968624639.

The spelling of 1423709 in words is "one million, four hundred twenty-three thousand, seven hundred nine".