40809431 has 4 divisors (see below), whose sum is σ = 43948632. Its totient is φ = 37670232.

The previous prime is 40809413. The next prime is 40809463. The reversal of 40809431 is 13490804.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40809431 is a prime.

It is a super-2 number, since 2×40809431² = 3330819317087522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40809394 and 40809403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40809031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1569581 + ... + 1569606.

It is an arithmetic number, because the mean of its divisors is an integer number (10987158).

Almost surely, 2^40809431 is an apocalyptic number.

40809431 is a deficient number, since it is larger than the sum of its proper divisors (3139201).

40809431 is a wasteful number, since it uses less digits than its factorization.

40809431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139200.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 40809431 is about 6388.2259665732. The cubic root of 40809431 is about 344.2866475693.

The spelling of 40809431 in words is "forty million, eight hundred nine thousand, four hundred thirty-one".