321618040 has 32 divisors (see below), whose sum is σ = 725481360. Its totient is φ = 128320000.

The previous prime is 321618013. The next prime is 321618041. The reversal of 321618040 is 40816123.

It is a junction number, because it is equal to n+sod(n) for n = 321617996 and 321618014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321618041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6015 + ... + 26065.

Almost surely, 2^321618040 is an apocalyptic number.

It is an amenable number.

321618040 is an abundant number, since it is smaller than the sum of its proper divisors (403863320).

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

321618040 is a wasteful number, since it uses less digits than its factorization.

321618040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20463 (or 20459 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 321618040 is about 17933.7123875677. The cubic root of 321618040 is about 685.1412783350.

The spelling of 321618040 in words is "three hundred twenty-one million, six hundred eighteen thousand, forty".