9927522405 has 30 divisors (see below), whose sum is σ = 17799598278. Its totient is φ = 5293609200.

The previous prime is 9927522403. The next prime is 9927522443. The reversal of 9927522405 is 5042257299.

It can be written as a sum of positive squares in only one way, i.e., 7942017924 + 1985504481 = 89118^2 + 44559^2 .

It is not a de Polignac number, because 9927522405 - 2¹ = 9927522403 is a prime.

It is a super-2 number, since 2×9927522405² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9927522403) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 2002680 + ... + 2007630.

Almost surely, 2^9927522405 is an apocalyptic number.

It is an amenable number.

9927522405 is a deficient number, since it is larger than the sum of its proper divisors (7872075873).

9927522405 is an frugal number, since it uses more digits than its factorization.

9927522405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9919 (or 4959 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 9927522405 is about 99636.9530094131. The cubic root of 9927522405 is about 2149.2171229347.

Multiplying 9927522405 by its sum of digits (45), we get a square (446738508225 = 668385²).

9927522405 divided by its sum of digits (45) gives a square (220611609 = 14853²).

The spelling of 9927522405 in words is "nine billion, nine hundred twenty-seven million, five hundred twenty-two thousand, four hundred five".