1423321220 has 24 divisors (see below), whose sum is σ = 2992694208. Its totient is φ = 568620000.

The previous prime is 1423321147. The next prime is 1423321231. The reversal of 1423321220 is 221233241.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1423321192 and 1423321201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27656 + ... + 60095.

It is an arithmetic number, because the mean of its divisors is an integer number (124695592).

Almost surely, 2^1423321220 is an apocalyptic number.

1423321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1423321220 is an abundant number, since it is smaller than the sum of its proper divisors (1569372988).

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

1423321220 is a wasteful number, since it uses less digits than its factorization.

1423321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88571 (or 88569 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1423321220 is about 37726.9296391848. The cubic root of 1423321220 is about 1124.8664783099.

Adding to 1423321220 its reverse (221233241), we get a palindrome (1644554461).

It can be divided in two parts, 14233 and 21220, that added together give a palindrome (35453).

The spelling of 1423321220 in words is "one billion, four hundred twenty-three million, three hundred twenty-one thousand, two hundred twenty".