1321290432 has 336 divisors, whose sum is σ = 4879140864. Its totient is φ = 332121600.

The previous prime is 1321290413. The next prime is 1321290433. The reversal of 1321290432 is 2340921231.

It is a happy number.

1321290432 is a `hidden beast` number, since 13 + 212 + 9 + 0 + 432 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a junction number, because it is equal to n+sod(n) for n = 1321290396 and 1321290405.

It is not an unprimeable number, because it can be changed into a prime (1321290433) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42622257 + ... + 42622287.

Almost surely, 2^1321290432 is an apocalyptic number.

1321290432 is a gapful number since it is divisible by the number (12) 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 1321290432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2439570432).

1321290432 is an abundant number, since it is smaller than the sum of its proper divisors (3557850432).

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

1321290432 is an equidigital number, since it uses as much as digits as its factorization.

1321290432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1321290432 is about 36349.5588969110. The cubic root of 1321290432 is about 1097.3186571901.

The spelling of 1321290432 in words is "one billion, three hundred twenty-one million, two hundred ninety thousand, four hundred thirty-two".