40604021 has 2 divisors, whose sum is σ = 40604022. Its totient is φ = 40604020.

The previous prime is 40603967. The next prime is 40604027. The reversal of 40604021 is 12040604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31080625 + 9523396 = 5575^2 + 3086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40604021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40604027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20302010 + 20302011.

It is an arithmetic number, because the mean of its divisors is an integer number (20302011).

Almost surely, 2^40604021 is an apocalyptic number.

It is an amenable number.

40604021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40604021 is an equidigital number, since it uses as much as digits as its factorization.

40604021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 40604021 is about 6372.1284513104. The cubic root of 40604021 is about 343.7080320775.

Adding to 40604021 its reverse (12040604), we get a palindrome (52644625).

The spelling of 40604021 in words is "forty million, six hundred four thousand, twenty-one".