1322979840 has 480 divisors, whose sum is σ = 5648138496. Its totient is φ = 278691840.

The previous prime is 1322979821. The next prime is 1322979857. The reversal of 1322979840 is 489792231.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a zygodrome in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2096325 + ... + 2096955.

Almost surely, 2^1322979840 is an apocalyptic number.

1322979840 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 1322979840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2824069248).

1322979840 is an abundant number, since it is smaller than the sum of its proper divisors (4325158656).

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

1322979840 is a wasteful number, since it uses less digits than its factorization.

1322979840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1322979840 is about 36372.7898297615. The cubic root of 1322979840 is about 1097.7861368937.

The spelling of 1322979840 in words is "one billion, three hundred twenty-two million, nine hundred seventy-nine thousand, eight hundred forty".