40639363 has 2 divisors, whose sum is σ = 40639364. Its totient is φ = 40639362.

The previous prime is 40639351. The next prime is 40639381. The reversal of 40639363 is 36393604.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40639363 is a prime.

It is not a weakly prime, because it can be changed into another prime (40639463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20319681 + 20319682.

It is an arithmetic number, because the mean of its divisors is an integer number (20319682).

Almost surely, 2^40639363 is an apocalyptic number.

40639363 is a deficient number, since it is larger than the sum of its proper divisors (1).

40639363 is an equidigital number, since it uses as much as digits as its factorization.

40639363 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 34.

The square root of 40639363 is about 6374.9010188394. The cubic root of 40639363 is about 343.8077250496.

The spelling of 40639363 in words is "forty million, six hundred thirty-nine thousand, three hundred sixty-three".