1972188788 has 6 divisors (see below), whose sum is σ = 3451330386. Its totient is φ = 986094392.

The previous prime is 1972188787. The next prime is 1972188817. The reversal of 1972188788 is 8878812791.

It can be written as a sum of positive squares in only one way, i.e., 1047299044 + 924889744 = 32362^2 + 30412^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1972188787) 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 as a sum of consecutive naturals, namely, 246523595 + ... + 246523602.

It is an arithmetic number, because the mean of its divisors is an integer number (575221731).

Almost surely, 2^1972188788 is an apocalyptic number.

It is an amenable number.

1972188788 is a deficient number, since it is larger than the sum of its proper divisors (1479141598).

1972188788 is a wasteful number, since it uses less digits than its factorization.

1972188788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493047201 (or 493047199 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 59.

The square root of 1972188788 is about 44409.3322174518. The cubic root of 1972188788 is about 1254.0537807180.

The spelling of 1972188788 in words is "one billion, nine hundred seventy-two million, one hundred eighty-eight thousand, seven hundred eighty-eight".