39945259 has 2 divisors, whose sum is σ = 39945260. Its totient is φ = 39945258.

The previous prime is 39945251. The next prime is 39945263. The reversal of 39945259 is 95254993.

It is a strong prime.

It is an emirp because it is prime and its reverse (95254993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39945259 - 2³ = 39945251 is a prime.

It is not a weakly prime, because it can be changed into another prime (39945251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19972629 + 19972630.

It is an arithmetic number, because the mean of its divisors is an integer number (19972630).

Almost surely, 2^39945259 is an apocalyptic number.

39945259 is a deficient number, since it is larger than the sum of its proper divisors (1).

39945259 is an equidigital number, since it uses as much as digits as its factorization.

39945259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 437400, while the sum is 46.

The square root of 39945259 is about 6320.2261826615. The cubic root of 39945259 is about 341.8391084580.

It can be divided in two parts, 39945 and 259, that added together give a palindrome (40204).

The spelling of 39945259 in words is "thirty-nine million, nine hundred forty-five thousand, two hundred fifty-nine".