921900890 has 8 divisors (see below), whose sum is σ = 1659421620. Its totient is φ = 368760352.

The previous prime is 921900887. The next prime is 921900899. The reversal of 921900890 is 98009129.

It can be written as a sum of positive squares in 2 ways, for example, as 811167361 + 110733529 = 28481^2 + 10523^2 .

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

It is not an unprimeable number, because it can be changed into a prime (921900899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46095035 + ... + 46095054.

Almost surely, 2^921900890 is an apocalyptic number.

921900890 is a deficient number, since it is larger than the sum of its proper divisors (737520730).

921900890 is a wasteful number, since it uses less digits than its factorization.

921900890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92190096.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 921900890 is about 30362.8208505073. The cubic root of 921900890 is about 973.2582148143.

The spelling of 921900890 in words is "nine hundred twenty-one million, nine hundred thousand, eight hundred ninety".