1321072434 has 72 divisors (see below), whose sum is σ = 3190876416. Its totient is φ = 394640400.

The previous prime is 1321072429. The next prime is 1321072453. The reversal of 1321072434 is 4342701231.

It is a happy number.

1321072434 is a `hidden beast` number, since 13 + 210 + 7 + 2 + 434 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1321072398 and 1321072407.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 150367 + ... + 158909.

It is an arithmetic number, because the mean of its divisors is an integer number (44317728).

Almost surely, 2^1321072434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321072434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1595438208).

1321072434 is an abundant number, since it is smaller than the sum of its proper divisors (1869803982).

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

1321072434 is a wasteful number, since it uses less digits than its factorization.

1321072434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8644 (or 8630 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 1321072434 is about 36346.5601398537. The cubic root of 1321072434 is about 1097.2583054754.

Adding to 1321072434 its reverse (4342701231), we get a palindrome (5663773665).

The spelling of 1321072434 in words is "one billion, three hundred twenty-one million, seventy-two thousand, four hundred thirty-four".