39443946025 has 81 divisors (see below), whose sum is σ = 56560431333. Its totient is φ = 27264494400.

The previous prime is 39443946011. The next prime is 39443946029. The reversal of 39443946025 is 52064934493.

It is a happy number.

The square root of 39443946025 is 198605.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4770526761 + 34673419264 = 69069^2 + 186208^2 .

It is not a de Polignac number, because 39443946025 - 2⁵ = 39443945993 is a prime.

It is a super-2 number, since 2×39443946025² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39443946025.

It is not an unprimeable number, because it can be changed into a prime (39443946029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 251235247 + ... + 251235403.

Almost surely, 2^39443946025 is an apocalyptic number.

39443946025 is the 198605-th square number.

39443946025 is the 99303-rd centered octagonal number.

It is an amenable number.

39443946025 is a deficient number, since it is larger than the sum of its proper divisors (17116485308).

39443946025 is a wasteful number, since it uses less digits than its factorization.

39443946025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 49.

Multiplying 39443946025 by its sum of digits (49), we get a square (1932753355225 = 1390235²).

The spelling of 39443946025 in words is "thirty-nine billion, four hundred forty-three million, nine hundred forty-six thousand, twenty-five".