9925399808 has 18 divisors (see below), whose sum is σ = 19812029034. Its totient is φ = 4962699776.

The previous prime is 9925399777. The next prime is 9925399837. The reversal of 9925399808 is 8089935299.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5096817664 + 4828582144 = 71392^2 + 69488^2 .

It is a super-3 number, since 3×9925399808³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19385291 + ... + 19385802.

Almost surely, 2^9925399808 is an apocalyptic number.

It is an amenable number.

9925399808 is a deficient number, since it is larger than the sum of its proper divisors (9886629226).

9925399808 is an equidigital number, since it uses as much as digits as its factorization.

9925399808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38771109 (or 38771095 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 62.

The square root of 9925399808 is about 99626.3007844816. The cubic root of 9925399808 is about 2149.0639377862.

The spelling of 9925399808 in words is "nine billion, nine hundred twenty-five million, three hundred ninety-nine thousand, eight hundred eight".