921209136 has 40 divisors (see below), whose sum is σ = 2380941360. Its totient is φ = 306921216.

The previous prime is 921209123. The next prime is 921209147. The reversal of 921209136 is 631902129.

It is a junction number, because it is equal to n+sod(n) for n = 921209097 and 921209106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146146 + ... + 152318.

It is an arithmetic number, because the mean of its divisors is an integer number (59523534).

Almost surely, 2^921209136 is an apocalyptic number.

It is an amenable number.

921209136 is an abundant number, since it is smaller than the sum of its proper divisors (1459732224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

921209136 is a wasteful number, since it uses less digits than its factorization.

921209136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9293 (or 9287 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 921209136 is about 30351.4272481542. The cubic root of 921209136 is about 973.0147238077.

The spelling of 921209136 in words is "nine hundred twenty-one million, two hundred nine thousand, one hundred thirty-six".