39623939 has 2 divisors, whose sum is σ = 39623940. Its totient is φ = 39623938.

The previous prime is 39623879. The next prime is 39623959. The reversal of 39623939 is 93932693.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39623939 - 2¹⁶ = 39558403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39623939.

It is not a weakly prime, because it can be changed into another prime (39623959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19811969 + 19811970.

It is an arithmetic number, because the mean of its divisors is an integer number (19811970).

Almost surely, 2^39623939 is an apocalyptic number.

39623939 is a deficient number, since it is larger than the sum of its proper divisors (1).

39623939 is an equidigital number, since it uses as much as digits as its factorization.

39623939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 236196, while the sum is 44.

The square root of 39623939 is about 6294.7548800569. The cubic root of 39623939 is about 340.9200541853.

The spelling of 39623939 in words is "thirty-nine million, six hundred twenty-three thousand, nine hundred thirty-nine".