40806397 has 2 divisors, whose sum is σ = 40806398. Its totient is φ = 40806396.

The previous prime is 40806373. The next prime is 40806413. The reversal of 40806397 is 79360804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36252441 + 4553956 = 6021^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 40806397 - 2²³ = 32417789 is a prime.

It is a super-2 number, since 2×40806397² = 3330324072243218, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40804397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20403198 + 20403199.

It is an arithmetic number, because the mean of its divisors is an integer number (20403199).

Almost surely, 2^40806397 is an apocalyptic number.

It is an amenable number.

40806397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40806397 is an equidigital number, since it uses as much as digits as its factorization.

40806397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 40806397 is about 6387.9884940410. The cubic root of 40806397 is about 344.2781152966.

The spelling of 40806397 in words is "forty million, eight hundred six thousand, three hundred ninety-seven".