40193917 has 2 divisors, whose sum is σ = 40193918. Its totient is φ = 40193916.

The previous prime is 40193897. The next prime is 40193929. The reversal of 40193917 is 71939104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32387481 + 7806436 = 5691^2 + 2794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40193917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40193947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20096958 + 20096959.

It is an arithmetic number, because the mean of its divisors is an integer number (20096959).

Almost surely, 2^40193917 is an apocalyptic number.

It is an amenable number.

40193917 is a deficient number, since it is larger than the sum of its proper divisors (1).

40193917 is an equidigital number, since it uses as much as digits as its factorization.

40193917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 40193917 is about 6339.8672699040. The cubic root of 40193917 is about 342.5469543312.

It can be divided in two parts, 401939 and 17, that added together give a square (401956 = 634²).

The spelling of 40193917 in words is "forty million, one hundred ninety-three thousand, nine hundred seventeen".