192920857 has 4 divisors (see below), whose sum is σ = 196083556. Its totient is φ = 189758160.

The previous prime is 192920809. The next prime is 192920881. The reversal of 192920857 is 758029291.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1679616 + 191241241 = 1296^2 + 13829^2 .

It is a cyclic number.

It is not a de Polignac number, because 192920857 - 2⁷ = 192920729 is a prime.

It is a super-2 number, since 2×192920857² = 74436914131228898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (192921857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1581258 + ... + 1581379.

It is an arithmetic number, because the mean of its divisors is an integer number (49020889).

Almost surely, 2^192920857 is an apocalyptic number.

It is an amenable number.

192920857 is a deficient number, since it is larger than the sum of its proper divisors (3162699).

192920857 is an equidigital number, since it uses as much as digits as its factorization.

192920857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3162698.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 192920857 is about 13889.5952784809. The cubic root of 192920857 is about 577.8206531203.

The spelling of 192920857 in words is "one hundred ninety-two million, nine hundred twenty thousand, eight hundred fifty-seven".