40320231 has 8 divisors (see below), whose sum is σ = 61440384. Its totient is φ = 23040120.

The previous prime is 40320229. The next prime is 40320233. The reversal of 40320231 is 13202304.

It is an interprime number because it is at equal distance from previous prime (40320229) and next prime (40320233).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40320231 - 2¹ = 40320229 is a prime.

It is a super-2 number, since 2×40320231² = 3251442055786722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40320231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40320233) 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, 959985 + ... + 960026.

It is an arithmetic number, because the mean of its divisors is an integer number (7680048).

Almost surely, 2^40320231 is an apocalyptic number.

40320231 is a deficient number, since it is larger than the sum of its proper divisors (21120153).

40320231 is a wasteful number, since it uses less digits than its factorization.

40320231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920021.

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

The square root of 40320231 is about 6349.8213360692. The cubic root of 40320231 is about 342.9054101441.

Adding to 40320231 its reverse (13202304), we get a palindrome (53522535).

The spelling of 40320231 in words is "forty million, three hundred twenty thousand, two hundred thirty-one".