920921866 has 8 divisors (see below), whose sum is σ = 1381628484. Its totient is φ = 460379040.

The previous prime is 920921857. The next prime is 920921873. The reversal of 920921866 is 668129029.

It can be written as a sum of positive squares in 2 ways, for example, as 644398225 + 276523641 = 25385^2 + 16629^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25765 + ... + 50056.

Almost surely, 2^920921866 is an apocalyptic number.

920921866 is a deficient number, since it is larger than the sum of its proper divisors (460706618).

920921866 is a wasteful number, since it uses less digits than its factorization.

920921866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81896.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 920921866 is about 30346.6944822661. The cubic root of 920921866 is about 972.9135716050.

The spelling of 920921866 in words is "nine hundred twenty million, nine hundred twenty-one thousand, eight hundred sixty-six".