1321744424 has 384 divisors, whose sum is σ = 3826569600. Its totient is φ = 418037760.

The previous prime is 1321744409. The next prime is 1321744433. The reversal of 1321744424 is 4244471231.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18106052 + ... + 18106124.

It is an arithmetic number, because the mean of its divisors is an integer number (9965025).

Almost surely, 2^1321744424 is an apocalyptic number.

1321744424 is a gapful number since it is divisible by the number (14) 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 1321744424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1913284800).

1321744424 is an abundant number, since it is smaller than the sum of its proper divisors (2504825176).

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

1321744424 is a wasteful number, since it uses less digits than its factorization.

1321744424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 142 counting only the distinct ones).

The product of its digits is 21504, while the sum is 32.

The square root of 1321744424 is about 36355.8031681326. The cubic root of 1321744424 is about 1097.4443214230. Note that the first 3 decimals are identical.

The spelling of 1321744424 in words is "one billion, three hundred twenty-one million, seven hundred forty-four thousand, four hundred twenty-four".