7489821 has 4 divisors (see below), whose sum is σ = 9986432. Its totient is φ = 4993212.

The previous prime is 7489787. The next prime is 7489829. The reversal of 7489821 is 1289847.

7489821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7489821 - 2¹⁰ = 7488797 is a prime.

It is a super-2 number, since 2×7489821² = 112194837224082, which contains 22 as substring.

It is a Duffinian number.

7489821 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7489821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7489829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1248301 + ... + 1248306.

It is an arithmetic number, because the mean of its divisors is an integer number (2496608).

Almost surely, 2^7489821 is an apocalyptic number.

It is an amenable number.

7489821 is a deficient number, since it is larger than the sum of its proper divisors (2496611).

7489821 is a wasteful number, since it uses less digits than its factorization.

7489821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496610.

The product of its digits is 32256, while the sum is 39.

The square root of 7489821 is about 2736.7537338972. The cubic root of 7489821 is about 195.6547876602.

The spelling of 7489821 in words is "seven million, four hundred eighty-nine thousand, eight hundred twenty-one".