39345991 has 2 divisors, whose sum is σ = 39345992. Its totient is φ = 39345990.

The previous prime is 39345959. The next prime is 39346001. The reversal of 39345991 is 19954393.

It is a strong prime.

It is an emirp because it is prime and its reverse (19954393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39345991 - 2⁵ = 39345959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39345091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19672995 + 19672996.

It is an arithmetic number, because the mean of its divisors is an integer number (19672996).

Almost surely, 2^39345991 is an apocalyptic number.

39345991 is a deficient number, since it is larger than the sum of its proper divisors (1).

39345991 is an equidigital number, since it uses as much as digits as its factorization.

39345991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 43.

The square root of 39345991 is about 6272.6382806599. The cubic root of 39345991 is about 340.1210382208.

The spelling of 39345991 in words is "thirty-nine million, three hundred forty-five thousand, nine hundred ninety-one".