1972225836 has 144 divisors (see below), whose sum is σ = 5815613440. Its totient is φ = 551940480.

The previous prime is 1972225817. The next prime is 1972225861. The reversal of 1972225836 is 6385222791.

It is a junction number, because it is equal to n+sod(n) for n = 1972225791 and 1972225800.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 3125241 + ... + 3125871.

Almost surely, 2^1972225836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1972225836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2907806720).

1972225836 is an abundant number, since it is smaller than the sum of its proper divisors (3843387604).

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

1972225836 is a wasteful number, since it uses less digits than its factorization.

1972225836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884 (or 879 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 1972225836 is about 44409.7493350278. The cubic root of 1972225836 is about 1254.0616332275.

The spelling of 1972225836 in words is "one billion, nine hundred seventy-two million, two hundred twenty-five thousand, eight hundred thirty-six".