1321645430 has 32 divisors (see below), whose sum is σ = 2764903680. Its totient is φ = 445453920.

The previous prime is 1321645393. The next prime is 1321645447. The reversal of 1321645430 is 345461231.

It is a junction number, because it is equal to n+sod(n) for n = 1321645393 and 1321645402.

It is a congruent number.

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, 155876 + ... + 164135.

It is an arithmetic number, because the mean of its divisors is an integer number (86403240).

Almost surely, 2^1321645430 is an apocalyptic number.

1321645430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321645430 is an abundant number, since it is smaller than the sum of its proper divisors (1443258250).

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

1321645430 is a wasteful number, since it uses less digits than its factorization.

1321645430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320084.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1321645430 is about 36354.4416818633. The cubic root of 1321645430 is about 1097.4169225014.

The spelling of 1321645430 in words is "one billion, three hundred twenty-one million, six hundred forty-five thousand, four hundred thirty".