40013431 has 2 divisors, whose sum is σ = 40013432. Its totient is φ = 40013430.

The previous prime is 40013423. The next prime is 40013447. The reversal of 40013431 is 13431004.

It is an a-pointer prime, because the next prime (40013447) can be obtained adding 40013431 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40013431 - 2³ = 40013423 is a prime.

It is a super-2 number, since 2×40013431² = 3202149320783522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40013731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20006715 + 20006716.

It is an arithmetic number, because the mean of its divisors is an integer number (20006716).

Almost surely, 2^40013431 is an apocalyptic number.

40013431 is a deficient number, since it is larger than the sum of its proper divisors (1).

40013431 is an equidigital number, since it uses as much as digits as its factorization.

40013431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 40013431 is about 6325.6170450004. The cubic root of 40013431 is about 342.0334628635.

Adding to 40013431 its reverse (13431004), we get a palindrome (53444435).

It can be divided in two parts, 400 and 13431, that added together give a palindrome (13831).

The spelling of 40013431 in words is "forty million, thirteen thousand, four hundred thirty-one".