40304421 has 6 divisors (see below), whose sum is σ = 58217510. Its totient is φ = 26869608.

The previous prime is 40304419. The next prime is 40304423. The reversal of 40304421 is 12440304.

It is an interprime number because it is at equal distance from previous prime (40304419) and next prime (40304423).

It can be written as a sum of positive squares in only one way, i.e., 39125025 + 1179396 = 6255^2 + 1086^2 .

It is not a de Polignac number, because 40304421 - 2¹ = 40304419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40304394 and 40304403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40304423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2239126 + ... + 2239143.

Almost surely, 2^40304421 is an apocalyptic number.

It is an amenable number.

40304421 is a deficient number, since it is larger than the sum of its proper divisors (17913089).

40304421 is a wasteful number, since it uses less digits than its factorization.

40304421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4478275 (or 4478272 counting only the distinct ones).

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

The square root of 40304421 is about 6348.5762970921. The cubic root of 40304421 is about 342.8605853077.

Adding to 40304421 its reverse (12440304), we get a palindrome (52744725).

The spelling of 40304421 in words is "forty million, three hundred four thousand, four hundred twenty-one".