1322426640 has 80 divisors (see below), whose sum is σ = 4120272000. Its totient is φ = 350862336.

The previous prime is 1322426627. The next prime is 1322426671. The reversal of 1322426640 is 466242231.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1322426598 and 1322426607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33916 + ... + 61604.

It is an arithmetic number, because the mean of its divisors is an integer number (51503400).

Almost surely, 2^1322426640 is an apocalyptic number.

1322426640 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 1322426640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2060136000).

1322426640 is an abundant number, since it is smaller than the sum of its proper divisors (2797845360).

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

1322426640 is a wasteful number, since it uses less digits than its factorization.

1322426640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27904 (or 27898 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 1322426640 is about 36365.1844488654. The cubic root of 1322426640 is about 1097.6331035824.

Adding to 1322426640 its reverse (466242231), we get a palindrome (1788668871).

The spelling of 1322426640 in words is "one billion, three hundred twenty-two million, four hundred twenty-six thousand, six hundred forty".