921411280 has 80 divisors (see below), whose sum is σ = 2241892224. Its totient is φ = 351521280.

The previous prime is 921411277. The next prime is 921411299. The reversal of 921411280 is 82114129.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×921411280² = 1697997493822476800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1050202 + ... + 1051078.

Almost surely, 2^921411280 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 921411280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1120946112).

921411280 is an abundant number, since it is smaller than the sum of its proper divisors (1320480944).

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

921411280 is a wasteful number, since it uses less digits than its factorization.

921411280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484 (or 1478 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 921411280 is about 30354.7571230606. The cubic root of 921411280 is about 973.0858892270.

The spelling of 921411280 in words is "nine hundred twenty-one million, four hundred eleven thousand, two hundred eighty".