1972218863 has 4 divisors (see below), whose sum is σ = 2040226440. Its totient is φ = 1904211288.

The previous prime is 1972218827. The next prime is 1972218869. The reversal of 1972218863 is 3688122791.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1972218863 - 2⁶ = 1972218799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1972218869) 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, 34003745 + ... + 34003802.

It is an arithmetic number, because the mean of its divisors is an integer number (510056610).

Almost surely, 2^1972218863 is an apocalyptic number.

1972218863 is a deficient number, since it is larger than the sum of its proper divisors (68007577).

1972218863 is an equidigital number, since it uses as much as digits as its factorization.

1972218863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68007576.

The product of its digits is 290304, while the sum is 47.

The square root of 1972218863 is about 44409.6708274223. The cubic root of 1972218863 is about 1254.0601552727.

The spelling of 1972218863 in words is "one billion, nine hundred seventy-two million, two hundred eighteen thousand, eight hundred sixty-three".