40507321 has 2 divisors, whose sum is σ = 40507322. Its totient is φ = 40507320.

The previous prime is 40507307. The next prime is 40507331. The reversal of 40507321 is 12370504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22325625 + 18181696 = 4725^2 + 4264^2 .

It is a cyclic number.

It is not a de Polignac number, because 40507321 - 2¹⁷ = 40376249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40507292 and 40507301.

It is not a weakly prime, because it can be changed into another prime (40507331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20253660 + 20253661.

It is an arithmetic number, because the mean of its divisors is an integer number (20253661).

Almost surely, 2^40507321 is an apocalyptic number.

It is an amenable number.

40507321 is a deficient number, since it is larger than the sum of its proper divisors (1).

40507321 is an equidigital number, since it uses as much as digits as its factorization.

40507321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 40507321 is about 6364.5361967704. The cubic root of 40507321 is about 343.4349639958.

Adding to 40507321 its reverse (12370504), we get a palindrome (52877825).

The spelling of 40507321 in words is "forty million, five hundred seven thousand, three hundred twenty-one".