40421431 has 4 divisors (see below), whose sum is σ = 41106600. Its totient is φ = 39736264.

The previous prime is 40421413. The next prime is 40421443. The reversal of 40421431 is 13412404.

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

It is not a de Polignac number, because 40421431 - 2⁵ = 40421399 is a prime.

It is a super-2 number, since 2×40421431² = 3267784168175522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40421399 and 40421408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40421411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342496 + ... + 342613.

It is an arithmetic number, because the mean of its divisors is an integer number (10276650).

Almost surely, 2^40421431 is an apocalyptic number.

40421431 is a deficient number, since it is larger than the sum of its proper divisors (685169).

40421431 is an equidigital number, since it uses as much as digits as its factorization.

40421431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685168.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 40421431 is about 6357.7850702898. The cubic root of 40421431 is about 343.1920572699.

Adding to 40421431 its reverse (13412404), we get a palindrome (53833835).

The spelling of 40421431 in words is "forty million, four hundred twenty-one thousand, four hundred thirty-one".