1721430123 has 24 divisors (see below), whose sum is σ = 2686390848. Its totient is φ = 977625936.

The previous prime is 1721430121. The next prime is 1721430127. The reversal of 1721430123 is 3210341271.

It is a happy number.

It is not a de Polignac number, because 1721430123 - 2¹ = 1721430121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1721430093 and 1721430102.

It is not an unprimeable number, because it can be changed into a prime (1721430121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11961 + ... + 59882.

It is an arithmetic number, because the mean of its divisors is an integer number (111932952).

Almost surely, 2^1721430123 is an apocalyptic number.

1721430123 is a deficient number, since it is larger than the sum of its proper divisors (964960725).

1721430123 is a wasteful number, since it uses less digits than its factorization.

1721430123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72023 (or 72016 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 1721430123 is about 41490.1207879659. The cubic root of 1721430123 is about 1198.4772636846.

Adding to 1721430123 its reverse (3210341271), we get a palindrome (4931771394).

The spelling of 1721430123 in words is "one billion, seven hundred twenty-one million, four hundred thirty thousand, one hundred twenty-three".