40018361 has 2 divisors, whose sum is σ = 40018362. Its totient is φ = 40018360.

The previous prime is 40018327. The next prime is 40018373. The reversal of 40018361 is 16381004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35331136 + 4687225 = 5944^2 + 2165^2 .

It is a cyclic number.

It is not a de Polignac number, because 40018361 - 2²² = 35824057 is a prime.

It is not a weakly prime, because it can be changed into another prime (40018061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20009180 + 20009181.

It is an arithmetic number, because the mean of its divisors is an integer number (20009181).

Almost surely, 2^40018361 is an apocalyptic number.

It is an amenable number.

40018361 is a deficient number, since it is larger than the sum of its proper divisors (1).

40018361 is an equidigital number, since it uses as much as digits as its factorization.

40018361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 40018361 is about 6326.0067183018. The cubic root of 40018361 is about 342.0475094447.

Adding to 40018361 its reverse (16381004), we get a palindrome (56399365).

The spelling of 40018361 in words is "forty million, eighteen thousand, three hundred sixty-one".