921492780 has 144 divisors (see below), whose sum is σ = 2941585920. Its totient is φ = 214845696.

The previous prime is 921492773. The next prime is 921492827. The reversal of 921492780 is 87294129.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 190269 + ... + 195051.

It is an arithmetic number, because the mean of its divisors is an integer number (20427680).

Almost surely, 2^921492780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 921492780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1470792960).

921492780 is an abundant number, since it is smaller than the sum of its proper divisors (2020093140).

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

921492780 is a wasteful number, since it uses less digits than its factorization.

921492780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4840 (or 4825 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 921492780 is about 30356.0995518199. The cubic root of 921492780 is about 973.1145786095.

The spelling of 921492780 in words is "nine hundred twenty-one million, four hundred ninety-two thousand, seven hundred eighty".