7251821 has 8 divisors (see below), whose sum is σ = 7480704. Its totient is φ = 7025760.

The previous prime is 7251791. The next prime is 7251823. The reversal of 7251821 is 1281527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7251821 - 2⁶ = 7251757 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 (7251823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5276 + ... + 6506.

It is an arithmetic number, because the mean of its divisors is an integer number (935088).

Almost surely, 2^7251821 is an apocalyptic number.

It is an amenable number.

7251821 is a deficient number, since it is larger than the sum of its proper divisors (228883).

7251821 is a wasteful number, since it uses less digits than its factorization.

7251821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411.

The product of its digits is 1120, while the sum is 26.

The square root of 7251821 is about 2692.9205335472. The cubic root of 7251821 is about 193.5600349654.

The spelling of 7251821 in words is "seven million, two hundred fifty-one thousand, eight hundred twenty-one".