7285921 has 4 divisors (see below), whose sum is σ = 7292052. Its totient is φ = 7279792.

The previous prime is 7285919. The next prime is 7285973. The reversal of 7285921 is 1295827.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1295827 = 13 ⋅99679.

It can be written as a sum of positive squares in 2 ways, for example, as 1597696 + 5688225 = 1264^2 + 2385^2 .

It is a cyclic number.

It is not a de Polignac number, because 7285921 - 2¹ = 7285919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7285981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 646 + ... + 3871.

It is an arithmetic number, because the mean of its divisors is an integer number (1823013).

Almost surely, 2^7285921 is an apocalyptic number.

It is an amenable number.

7285921 is a deficient number, since it is larger than the sum of its proper divisors (6131).

7285921 is a wasteful number, since it uses less digits than its factorization.

7285921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6130.

The product of its digits is 10080, while the sum is 34.

The square root of 7285921 is about 2699.2445239363. The cubic root of 7285921 is about 193.8629509973.

The spelling of 7285921 in words is "seven million, two hundred eighty-five thousand, nine hundred twenty-one".