1321237040 has 40 divisors (see below), whose sum is σ = 3106408320. Its totient is φ = 522553856.

The previous prime is 1321237037. The next prime is 1321237061. The reversal of 1321237040 is 407321231.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1321236997 and 1321237015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85664 + ... + 99903.

It is an arithmetic number, because the mean of its divisors is an integer number (77660208).

Almost surely, 2^1321237040 is an apocalyptic number.

1321237040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321237040 is an abundant number, since it is smaller than the sum of its proper divisors (1785171280).

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

1321237040 is a wasteful number, since it uses less digits than its factorization.

1321237040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185669 (or 185663 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 1321237040 is about 36348.8244651736. The cubic root of 1321237040 is about 1097.3038764814.

Adding to 1321237040 its reverse (407321231), we get a palindrome (1728558271).

The spelling of 1321237040 in words is "one billion, three hundred twenty-one million, two hundred thirty-seven thousand, forty".