18929907396 has 81 divisors (see below), whose sum is σ = 50071737261. Its totient is φ = 6029568864.

The previous prime is 18929907391. The next prime is 18929907401. The reversal of 18929907396 is 69370992981.

It is a happy number.

The square root of 18929907396 is 137586.

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

It is an interprime number because it is at equal distance from previous prime (18929907391) and next prime (18929907401).

It can be written as a sum of positive squares in only one way, i.e., 16294522500 + 2635384896 = 127650^2 + 51336^2 .

It is a super-2 number, since 2×18929907396² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18929907391) 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 26 ways as a sum of consecutive naturals, for example, 18986370 + ... + 18987366.

Almost surely, 2^18929907396 is an apocalyptic number.

18929907396 is the 137586-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18929907396

18929907396 is an abundant number, since it is smaller than the sum of its proper divisors (31141829865).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18929907396 is an equidigital number, since it uses as much as digits as its factorization.

18929907396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050 (or 1025 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 63.

The spelling of 18929907396 in words is "eighteen billion, nine hundred twenty-nine million, nine hundred seven thousand, three hundred ninety-six".