1631972938 has 8 divisors (see below), whose sum is σ = 2507665860. Its totient is φ = 796084320.

The previous prime is 1631972933. The next prime is 1631972939. The reversal of 1631972938 is 8392791361.

It can be written as a sum of positive squares in 2 ways, for example, as 1627880409 + 4092529 = 40347^2 + 2023^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1631972891 and 1631972900.

It is not an unprimeable number, because it can be changed into a prime (1631972933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9950973 + ... + 9951136.

Almost surely, 2^1631972938 is an apocalyptic number.

1631972938 is a deficient number, since it is larger than the sum of its proper divisors (875692922).

1631972938 is a wasteful number, since it uses less digits than its factorization.

1631972938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19902152.

The product of its digits is 489888, while the sum is 49.

The square root of 1631972938 is about 40397.6848098997. The cubic root of 1631972938 is about 1177.3465556755.

The spelling of 1631972938 in words is "one billion, six hundred thirty-one million, nine hundred seventy-two thousand, nine hundred thirty-eight".