40430421 has 10 divisors (see below), whose sum is σ = 60396182. Its totient is φ = 26953560.

The previous prime is 40430419. The next prime is 40430447. The reversal of 40430421 is 12403404.

It can be written as a sum of positive squares in only one way, i.e., 40259025 + 171396 = 6345^2 + 414^2 .

It is not a de Polignac number, because 40430421 - 2¹ = 40430419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40430394 and 40430403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40430491) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 249490 + ... + 249651.

Almost surely, 2^40430421 is an apocalyptic number.

It is an amenable number.

40430421 is a deficient number, since it is larger than the sum of its proper divisors (19965761).

40430421 is an equidigital number, since it uses as much as digits as its factorization.

40430421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499153 (or 499144 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 40430421 is about 6358.4920382116. The cubic root of 40430421 is about 343.2174981298.

Adding to 40430421 its reverse (12403404), we get a palindrome (52833825).

The spelling of 40430421 in words is "forty million, four hundred thirty thousand, four hundred twenty-one".