39720623 has 2 divisors, whose sum is σ = 39720624. Its totient is φ = 39720622.

The previous prime is 39720617. The next prime is 39720643. The reversal of 39720623 is 32602793.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39720623 - 2⁴ = 39720607 is a prime.

It is a super-3 number, since 3×39720623³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39720623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39720613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19860311 + 19860312.

It is an arithmetic number, because the mean of its divisors is an integer number (19860312).

Almost surely, 2^39720623 is an apocalyptic number.

39720623 is a deficient number, since it is larger than the sum of its proper divisors (1).

39720623 is an equidigital number, since it uses as much as digits as its factorization.

39720623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 32.

The square root of 39720623 is about 6302.4299282102. The cubic root of 39720623 is about 341.1971151616.

The spelling of 39720623 in words is "thirty-nine million, seven hundred twenty thousand, six hundred twenty-three".