40663639 has 2 divisors, whose sum is σ = 40663640. Its totient is φ = 40663638.

The previous prime is 40663633. The next prime is 40663657. The reversal of 40663639 is 93636604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40663639 - 2³ = 40663631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40663598 and 40663607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40663631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20331819 + 20331820.

It is an arithmetic number, because the mean of its divisors is an integer number (20331820).

Almost surely, 2^40663639 is an apocalyptic number.

40663639 is a deficient number, since it is larger than the sum of its proper divisors (1).

40663639 is an equidigital number, since it uses as much as digits as its factorization.

40663639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 37.

The square root of 40663639 is about 6376.8047641432. The cubic root of 40663639 is about 343.8761694869.

The spelling of 40663639 in words is "forty million, six hundred sixty-three thousand, six hundred thirty-nine".