40321320 has 64 divisors (see below), whose sum is σ = 130273920. Its totient is φ = 9924864.

The previous prime is 40321313. The next prime is 40321373. The reversal of 40321320 is 2312304.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 40321320.

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, 11364 + ... + 14483.

It is an arithmetic number, because the mean of its divisors is an integer number (2035530).

Almost surely, 2^40321320 is an apocalyptic number.

40321320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40321320 is an abundant number, since it is smaller than the sum of its proper divisors (89952600).

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

40321320 is a wasteful number, since it uses less digits than its factorization.

40321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25874 (or 25870 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 40321320 is about 6349.9070859344. The cubic root of 40321320 is about 342.9084972679.

Adding to 40321320 its reverse (2312304), we get a palindrome (42633624).

The spelling of 40321320 in words is "forty million, three hundred twenty-one thousand, three hundred twenty".