40639117 has 2 divisors, whose sum is σ = 40639118. Its totient is φ = 40639116.

The previous prime is 40639103. The next prime is 40639127. The reversal of 40639117 is 71193604.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24147396 + 16491721 = 4914^2 + 4061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40639117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40639127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20319558 + 20319559.

It is an arithmetic number, because the mean of its divisors is an integer number (20319559).

Almost surely, 2^40639117 is an apocalyptic number.

It is an amenable number.

40639117 is a deficient number, since it is larger than the sum of its proper divisors (1).

40639117 is an equidigital number, since it uses as much as digits as its factorization.

40639117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 40639117 is about 6374.8817243930. The cubic root of 40639117 is about 343.8070313308.

The spelling of 40639117 in words is "forty million, six hundred thirty-nine thousand, one hundred seventeen".