1723428 has 54 divisors (see below), whose sum is σ = 5072886. Its totient is φ = 491904.

The previous prime is 1723417. The next prime is 1723451. The reversal of 1723428 is 8243271.

It can be written as a sum of positive squares in only one way, i.e., 1695204 + 28224 = 1302^2 + 168^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1276 + ... + 2252.

2^1723428 is an apocalyptic number.

1723428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1723428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2536443).

1723428 is an abundant number, since it is smaller than the sum of its proper divisors (3349458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1723428 is a wasteful number, since it uses less digits than its factorization.

1723428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001 (or 989 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 1723428 is about 1312.7939670794. The cubic root of 1723428 is about 119.8940731901.

Adding to 1723428 its reverse (8243271), we get a palindrome (9966699).

It can be divided in two parts, 172 and 3428, that added together give a square (3600 = 60²).

The spelling of 1723428 in words is "one million, seven hundred twenty-three thousand, four hundred twenty-eight".