921919284 has 72 divisors (see below), whose sum is σ = 2737836192. Its totient is φ = 257878080.

The previous prime is 921919283. The next prime is 921919303. The reversal of 921919284 is 482919129.

It is a super-2 number, since 2×921919284² = 1699870332422145312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921919283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84394 + ... + 94689.

Almost surely, 2^921919284 is an apocalyptic number.

It is an amenable number.

921919284 is an abundant number, since it is smaller than the sum of its proper divisors (1815916908).

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

921919284 is a wasteful number, since it uses less digits than its factorization.

921919284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179117 (or 179112 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 921919284 is about 30363.1237523414. The cubic root of 921919284 is about 973.2646876694.

It can be divided in two parts, 92191 and 9284, that added together give a triangular number (101475 = T₄₅₀).

The spelling of 921919284 in words is "nine hundred twenty-one million, nine hundred nineteen thousand, two hundred eighty-four".