40542431 has 2 divisors, whose sum is σ = 40542432. Its totient is φ = 40542430.

The previous prime is 40542419. The next prime is 40542457. The reversal of 40542431 is 13424504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40542431 - 2⁶ = 40542367 is a prime.

It is a super-2 number, since 2×40542431² = 3287377422779522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40542397 and 40542406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40542401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20271215 + 20271216.

It is an arithmetic number, because the mean of its divisors is an integer number (20271216).

Almost surely, 2^40542431 is an apocalyptic number.

40542431 is a deficient number, since it is larger than the sum of its proper divisors (1).

40542431 is an equidigital number, since it uses as much as digits as its factorization.

40542431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 40542431 is about 6367.2938521793. The cubic root of 40542431 is about 343.5341602166.

Adding to 40542431 its reverse (13424504), we get a palindrome (53966935).

The spelling of 40542431 in words is "forty million, five hundred forty-two thousand, four hundred thirty-one".