321240040 has 32 divisors (see below), whose sum is σ = 788499360. Its totient is φ = 116814400.

The previous prime is 321240037. The next prime is 321240053. The reversal of 321240040 is 40042123.

It is a junction number, because it is equal to n+sod(n) for n = 321239996 and 321240023.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364606 + ... + 365485.

It is an arithmetic number, because the mean of its divisors is an integer number (24640605).

Almost surely, 2^321240040 is an apocalyptic number.

It is an amenable number.

321240040 is an abundant number, since it is smaller than the sum of its proper divisors (467259320).

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

321240040 is a wasteful number, since it uses less digits than its factorization.

321240040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730113 (or 730109 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 321240040 is about 17923.1704784617. The cubic root of 321240040 is about 684.8727559483.

Adding to 321240040 its reverse (40042123), we get a palindrome (361282163).

The spelling of 321240040 in words is "three hundred twenty-one million, two hundred forty thousand, forty".