40304021 has 4 divisors (see below), whose sum is σ = 40987200. Its totient is φ = 39620844.

The previous prime is 40303993. The next prime is 40304041. The reversal of 40304021 is 12040304.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40304021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40303987 and 40304005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40304041) 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, 341501 + ... + 341618.

It is an arithmetic number, because the mean of its divisors is an integer number (10246800).

Almost surely, 2^40304021 is an apocalyptic number.

It is an amenable number.

40304021 is a deficient number, since it is larger than the sum of its proper divisors (683179).

40304021 is an equidigital number, since it uses as much as digits as its factorization.

40304021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683178.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 40304021 is about 6348.5447938878. The cubic root of 40304021 is about 342.8594510675.

Adding to 40304021 its reverse (12040304), we get a palindrome (52344325).

The spelling of 40304021 in words is "forty million, three hundred four thousand, twenty-one".