40400431 has 2 divisors, whose sum is σ = 40400432. Its totient is φ = 40400430.

The previous prime is 40400419. The next prime is 40400453. The reversal of 40400431 is 13400404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40400431 - 2¹¹ = 40398383 is a prime.

It is a super-2 number, since 2×40400431² = 3264389649971522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40400131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20200215 + 20200216.

It is an arithmetic number, because the mean of its divisors is an integer number (20200216).

Almost surely, 2^40400431 is an apocalyptic number.

40400431 is a deficient number, since it is larger than the sum of its proper divisors (1).

40400431 is an equidigital number, since it uses as much as digits as its factorization.

40400431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40400431 is about 6356.1333371791. The cubic root of 40400431 is about 343.1326145315.

Adding to 40400431 its reverse (13400404), we get a palindrome (53800835).

The spelling of 40400431 in words is "forty million, four hundred thousand, four hundred thirty-one".