1970921772 has 36 divisors (see below), whose sum is σ = 5116705776. Its totient is φ = 639217440.

The previous prime is 1970921767. The next prime is 1970921779. The reversal of 1970921772 is 2771290791.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1970921779) 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 11 ways as a sum of consecutive naturals, for example, 738504 + ... + 741167.

It is an arithmetic number, because the mean of its divisors is an integer number (142130716).

Almost surely, 2^1970921772 is an apocalyptic number.

1970921772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1970921772 is an abundant number, since it is smaller than the sum of its proper divisors (3145784004).

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

1970921772 is a wasteful number, since it uses less digits than its factorization.

1970921772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479718 (or 1479713 counting only the distinct ones).

The product of its (nonzero) digits is 111132, while the sum is 45.

The square root of 1970921772 is about 44395.0647257102. The cubic root of 1970921772 is about 1253.7851711076.

The spelling of 1970921772 in words is "one billion, nine hundred seventy million, nine hundred twenty-one thousand, seven hundred seventy-two".