40003431 has 16 divisors (see below), whose sum is σ = 60820704. Its totient is φ = 23169024.

The previous prime is 40003409. The next prime is 40003451. The reversal of 40003431 is 13430004.

It is a de Polignac number, because none of the positive numbers 2^k-40003431 is a prime.

It is a super-2 number, since 2×40003431² = 3200548983543522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40003431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40003451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29506 + ... + 30831.

It is an arithmetic number, because the mean of its divisors is an integer number (3801294).

Almost surely, 2^40003431 is an apocalyptic number.

40003431 is a deficient number, since it is larger than the sum of its proper divisors (20817273).

40003431 is a wasteful number, since it uses less digits than its factorization.

40003431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60370.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 40003431 is about 6324.8265588868. The cubic root of 40003431 is about 342.0049672682.

Adding to 40003431 its reverse (13430004), we get a palindrome (53433435).

It can be divided in two parts, 400034 and 31, that added together give a triangular number (400065 = T₈₉₄).

The spelling of 40003431 in words is "forty million, three thousand, four hundred thirty-one".