1972808401 has 4 divisors (see below), whose sum is σ = 2088855972. Its totient is φ = 1856760832.

The previous prime is 1972808389. The next prime is 1972808413. The reversal of 1972808401 is 1048082791.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1972808389) and next prime (1972808413).

It can be written as a sum of positive squares in 2 ways, for example, as 1681082001 + 291726400 = 41001^2 + 17080^2 .

It is a cyclic number.

It is not a de Polignac number, because 1972808401 - 2⁷ = 1972808273 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1942808401) 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 3 ways as a sum of consecutive naturals, for example, 58023760 + ... + 58023793.

It is an arithmetic number, because the mean of its divisors is an integer number (522213993).

Almost surely, 2^1972808401 is an apocalyptic number.

It is an amenable number.

1972808401 is a deficient number, since it is larger than the sum of its proper divisors (116047571).

1972808401 is a wasteful number, since it uses less digits than its factorization.

1972808401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116047570.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 1972808401 is about 44416.3078271934. The cubic root of 1972808401 is about 1254.1850978735.

The spelling of 1972808401 in words is "one billion, nine hundred seventy-two million, eight hundred eight thousand, four hundred one".