7274821 has 4 divisors (see below), whose sum is σ = 7280812. Its totient is φ = 7268832.

The previous prime is 7274807. The next prime is 7274857. The reversal of 7274821 is 1284727.

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: 1284727 = 73 ⋅17599.

It can be written as a sum of positive squares in 2 ways, for example, as 3330625 + 3944196 = 1825^2 + 1986^2 .

It is a cyclic number.

It is not a de Polignac number, because 7274821 - 2⁵ = 7274789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7271821) 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, 456 + ... + 3841.

It is an arithmetic number, because the mean of its divisors is an integer number (1820203).

Almost surely, 2^7274821 is an apocalyptic number.

It is an amenable number.

7274821 is a deficient number, since it is larger than the sum of its proper divisors (5991).

7274821 is a wasteful number, since it uses less digits than its factorization.

7274821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5990.

The product of its digits is 6272, while the sum is 31.

The square root of 7274821 is about 2697.1876093442. The cubic root of 7274821 is about 193.7644517836.

The spelling of 7274821 in words is "seven million, two hundred seventy-four thousand, eight hundred twenty-one".