40345231 has 2 divisors, whose sum is σ = 40345232. Its totient is φ = 40345230.

The previous prime is 40345219. The next prime is 40345273. The reversal of 40345231 is 13254304.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40345231 - 2⁷ = 40345103 is a prime.

It is a super-2 number, since 2×40345231² = 3255475328886722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40345631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20172615 + 20172616.

It is an arithmetic number, because the mean of its divisors is an integer number (20172616).

Almost surely, 2^40345231 is an apocalyptic number.

40345231 is a deficient number, since it is larger than the sum of its proper divisors (1).

40345231 is an equidigital number, since it uses as much as digits as its factorization.

40345231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 40345231 is about 6351.7895903438. The cubic root of 40345231 is about 342.9762667494.

Adding to 40345231 its reverse (13254304), we get a palindrome (53599535).

The spelling of 40345231 in words is "forty million, three hundred forty-five thousand, two hundred thirty-one".