1022785992 has 36 divisors (see below), whose sum is σ = 2770780545. Its totient is φ = 340838208.

The previous prime is 1022785961. The next prime is 1022785993. The reversal of 1022785992 is 2995872201.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 896762916 + 126023076 = 29946^2 + 11226^2 .

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

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=22614.

It is not an unprimeable number, because it can be changed into a prime (1022785993) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 269484 + ... + 273252.

Almost surely, 2^1022785992 is an apocalyptic number.

1022785992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1022785992 is an abundant number, since it is smaller than the sum of its proper divisors (1747994553).

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

1022785992 is an frugal number, since it uses more digits than its factorization.

1022785992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7550 (or 3774 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 1022785992 is about 31981.0254995052. The cubic root of 1022785992 is about 1007.5383609864.

The spelling of 1022785992 in words is "one billion, twenty-two million, seven hundred eighty-five thousand, nine hundred ninety-two".