1423321645 has 4 divisors (see below), whose sum is σ = 1707985980. Its totient is φ = 1138657312.

The previous prime is 1423321609. The next prime is 1423321657. The reversal of 1423321645 is 5461233241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 449694436 + 973627209 = 21206^2 + 31203^2 .

It is a cyclic number.

It is not a de Polignac number, because 1423321645 - 2²⁷ = 1289103917 is a prime.

It is a super-3 number, since 3×1423321645³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142332160 + ... + 142332169.

It is an arithmetic number, because the mean of its divisors is an integer number (426996495).

Almost surely, 2^1423321645 is an apocalyptic number.

It is an amenable number.

1423321645 is a deficient number, since it is larger than the sum of its proper divisors (284664335).

1423321645 is an equidigital number, since it uses as much as digits as its factorization.

1423321645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284664334.

The product of its digits is 17280, while the sum is 31.

The square root of 1423321645 is about 37726.9352717657. The cubic root of 1423321645 is about 1124.8665902706.

Adding to 1423321645 its reverse (5461233241), we get a palindrome (6884554886).

The spelling of 1423321645 in words is "one billion, four hundred twenty-three million, three hundred twenty-one thousand, six hundred forty-five".