1321423400 has 192 divisors, whose sum is σ = 3574324800. Its totient is φ = 449280000.

The previous prime is 1321423361. The next prime is 1321423429. The reversal of 1321423400 is 43241231.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4221644 + ... + 4221956.

It is an arithmetic number, because the mean of its divisors is an integer number (18616275).

Almost surely, 2^1321423400 is an apocalyptic number.

1321423400 is a gapful number since it is divisible by the number (10) 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 1321423400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1787162400).

1321423400 is an abundant number, since it is smaller than the sum of its proper divisors (2252901400).

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

1321423400 is a wasteful number, since it uses less digits than its factorization.

1321423400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460 (or 451 counting only the distinct ones).

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

The square root of 1321423400 is about 36351.3878689659. The cubic root of 1321423400 is about 1097.3554654925.

Adding to 1321423400 its reverse (43241231), we get a palindrome (1364664631).

The spelling of 1321423400 in words is "one billion, three hundred twenty-one million, four hundred twenty-three thousand, four hundred".