1320267400 has 48 divisors (see below), whose sum is σ = 3088530000. Its totient is φ = 524854080.

The previous prime is 1320267391. The next prime is 1320267407. The reversal of 1320267400 is 47620231.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1320267407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12351 + ... + 52849.

It is an arithmetic number, because the mean of its divisors is an integer number (64344375).

Almost surely, 2^1320267400 is an apocalyptic number.

1320267400 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 1320267400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1544265000).

1320267400 is an abundant number, since it is smaller than the sum of its proper divisors (1768262600).

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

1320267400 is a wasteful number, since it uses less digits than its factorization.

1320267400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40678 (or 40669 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 1320267400 is about 36335.4840342055. The cubic root of 1320267400 is about 1097.0353780748.

Adding to 1320267400 its reverse (47620231), we get a palindrome (1367887631).

The spelling of 1320267400 in words is "one billion, three hundred twenty million, two hundred sixty-seven thousand, four hundred".