1992878901 has 24 divisors (see below), whose sum is σ = 3101618520. Its totient is φ = 1225760256.

The previous prime is 1992878893. The next prime is 1992878939. The reversal of 1992878901 is 1098782991.

It can be written as a sum of positive squares in 4 ways, for example, as 462035025 + 1530843876 = 21495^2 + 39126^2 .

It is not a de Polignac number, because 1992878901 - 2³ = 1992878893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1992878101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 344505 + ... + 350241.

It is an arithmetic number, because the mean of its divisors is an integer number (129234105).

Almost surely, 2^1992878901 is an apocalyptic number.

It is an amenable number.

1992878901 is a deficient number, since it is larger than the sum of its proper divisors (1108739619).

1992878901 is a wasteful number, since it uses less digits than its factorization.

1992878901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8725 (or 8722 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The square root of 1992878901 is about 44641.6722469040. The cubic root of 1992878901 is about 1258.4239345473.

The spelling of 1992878901 in words is "one billion, nine hundred ninety-two million, eight hundred seventy-eight thousand, nine hundred one".