1728420423 has 8 divisors (see below), whose sum is σ = 2305555200. Its totient is φ = 1151782968.

The previous prime is 1728420409. The next prime is 1728420431. The reversal of 1728420423 is 3240248271.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1728420423 - 2⁵ = 1728420391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728420523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116143 + ... + 130176.

It is an arithmetic number, because the mean of its divisors is an integer number (288194400).

Almost surely, 2^1728420423 is an apocalyptic number.

1728420423 is a deficient number, since it is larger than the sum of its proper divisors (577134777).

1728420423 is a wasteful number, since it uses less digits than its factorization.

1728420423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248661.

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 1728420423 is about 41574.2759768586. The cubic root of 1728420423 is about 1200.0973122473.

Adding to 1728420423 its reverse (3240248271), we get a palindrome (4968668694).

The spelling of 1728420423 in words is "one billion, seven hundred twenty-eight million, four hundred twenty thousand, four hundred twenty-three".