40425431 has 2 divisors, whose sum is σ = 40425432. Its totient is φ = 40425430.

The previous prime is 40425419. The next prime is 40425433. The reversal of 40425431 is 13452404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40425431 - 2¹⁸ = 40163287 is a prime.

It is a super-2 number, since 2×40425431² = 3268430943071522, which contains 22 as substring.

Together with 40425433, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2458004 and since 40425431 and 2458004 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 40425397 and 40425406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40425433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20212715 + 20212716.

It is an arithmetic number, because the mean of its divisors is an integer number (20212716).

Almost surely, 2^40425431 is an apocalyptic number.

40425431 is a deficient number, since it is larger than the sum of its proper divisors (1).

40425431 is an equidigital number, since it uses as much as digits as its factorization.

40425431 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 40425431 is about 6358.0996374703. The cubic root of 40425431 is about 343.2033773618.

Adding to 40425431 its reverse (13452404), we get a palindrome (53877835).

The spelling of 40425431 in words is "forty million, four hundred twenty-five thousand, four hundred thirty-one".