40397231 has 8 divisors (see below), whose sum is σ = 46293120. Its totient is φ = 34532568.

The previous prime is 40397221. The next prime is 40397243. The reversal of 40397231 is 13279304.

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

It is a de Polignac number, because none of the positive numbers 2^k-40397231 is a prime.

It is a super-2 number, since 2×40397231² = 3263872544934722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40397194 and 40397203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40397221) 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, 4961 + ... + 10266.

It is an arithmetic number, because the mean of its divisors is an integer number (5786640).

Almost surely, 2^40397231 is an apocalyptic number.

40397231 is a deficient number, since it is larger than the sum of its proper divisors (5895889).

40397231 is a wasteful number, since it uses less digits than its factorization.

40397231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15613.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 40397231 is about 6355.8816068269. The cubic root of 40397231 is about 343.1235547819.

The spelling of 40397231 in words is "forty million, three hundred ninety-seven thousand, two hundred thirty-one".