1723431 has 4 divisors (see below), whose sum is σ = 2297912. Its totient is φ = 1148952.

The previous prime is 1723417. The next prime is 1723451. The reversal of 1723431 is 1343271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1343271 = 3 ⋅447757.

It is not a de Polignac number, because 1723431 - 2⁷ = 1723303 is a prime.

It is a super-2 number, since 2×1723431² = 5940428823522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

1723431 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1723398 and 1723407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1723451) 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, 287236 + ... + 287241.

It is an arithmetic number, because the mean of its divisors is an integer number (574478).

2^1723431 is an apocalyptic number.

1723431 is a deficient number, since it is larger than the sum of its proper divisors (574481).

1723431 is an equidigital number, since it uses as much as digits as its factorization.

1723431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574480.

The product of its digits is 504, while the sum is 21.

The square root of 1723431 is about 1312.7951096801. The cubic root of 1723431 is about 119.8941427573.

The spelling of 1723431 in words is "one million, seven hundred twenty-three thousand, four hundred thirty-one".