7387721 has 8 divisors (see below), whose sum is σ = 8337600. Its totient is φ = 6484240.

The previous prime is 7387691. The next prime is 7387733. The reversal of 7387721 is 1277837.

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 7387721 - 2⁶ = 7387657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7381721) 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 7 ways as a sum of consecutive naturals, for example, 11261 + ... + 11898.

It is an arithmetic number, because the mean of its divisors is an integer number (1042200).

Almost surely, 2^7387721 is an apocalyptic number.

It is an amenable number.

7387721 is a deficient number, since it is larger than the sum of its proper divisors (949879).

7387721 is a wasteful number, since it uses less digits than its factorization.

7387721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23199.

The product of its digits is 16464, while the sum is 35.

The square root of 7387721 is about 2718.0362396407. The cubic root of 7387721 is about 194.7616724570.

The spelling of 7387721 in words is "seven million, three hundred eighty-seven thousand, seven hundred twenty-one".