921193830 has 64 divisors (see below), whose sum is σ = 2535782400. Its totient is φ = 237725280.

The previous prime is 921193829. The next prime is 921193837. The reversal of 921193830 is 38391129.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921193837) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46660 + ... + 63399.

It is an arithmetic number, because the mean of its divisors is an integer number (39621600).

Almost surely, 2^921193830 is an apocalyptic number.

921193830 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

921193830 is an abundant number, since it is smaller than the sum of its proper divisors (1614588570).

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

921193830 is a wasteful number, since it uses less digits than its factorization.

921193830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110106 (or 110100 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 921193830 is about 30351.1751008095. The cubic root of 921193830 is about 973.0093348592.

It can be divided in two parts, 9211 and 93830, that added together give a square (103041 = 321²).

The spelling of 921193830 in words is "nine hundred twenty-one million, one hundred ninety-three thousand, eight hundred thirty".