1992477897 has 24 divisors (see below), whose sum is σ = 2903791176. Its totient is φ = 1316480256.

The previous prime is 1992477887. The next prime is 1992477901. The reversal of 1992477897 is 7987742991.

It can be written as a sum of positive squares in 4 ways, for example, as 529874361 + 1462603536 = 23019^2 + 38244^2 .

It is not a de Polignac number, because 1992477897 - 2¹⁰ = 1992476873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1992477887) 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, 489093 + ... + 493149.

It is an arithmetic number, because the mean of its divisors is an integer number (120991299).

Almost surely, 2^1992477897 is an apocalyptic number.

It is an amenable number.

1992477897 is a deficient number, since it is larger than the sum of its proper divisors (911313279).

1992477897 is a wasteful number, since it uses less digits than its factorization.

1992477897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4537 (or 4534 counting only the distinct ones).

The product of its digits is 16003008, while the sum is 63.

The square root of 1992477897 is about 44637.1806569367. The cubic root of 1992477897 is about 1258.3395228482.

The spelling of 1992477897 in words is "one billion, nine hundred ninety-two million, four hundred seventy-seven thousand, eight hundred ninety-seven".