39925234969 has 3 divisors (see below), whose sum is σ = 39925434783. Its totient is φ = 39925035156.

The previous prime is 39925234949. The next prime is 39925234981. The reversal of 39925234969 is 96943252993.

The square root of 39925234969 is 199813.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 39922038025 + 3196944 = 199805^2 + 1788^2 .

It is not a de Polignac number, because 39925234969 - 2⁷ = 39925234841 is a prime.

It is a super-2 number, since 2×39925234969² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39925234939) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 99907 + ... + 299719.

It is an arithmetic number, because the mean of its divisors is an integer number (13308478261).

Almost surely, 2^39925234969 is an apocalyptic number.

39925234969 is the 199813-rd square number.

39925234969 is the 99907-th centered octagonal number.

It is an amenable number.

39925234969 is a deficient number, since it is larger than the sum of its proper divisors (199814).

39925234969 is an frugal number, since it uses more digits than its factorization.

39925234969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399626 (or 199813 counting only the distinct ones).

The product of its digits is 28343520, while the sum is 61.

The spelling of 39925234969 in words is "thirty-nine billion, nine hundred twenty-five million, two hundred thirty-four thousand, nine hundred sixty-nine".