7535721 has 8 divisors (see below), whose sum is σ = 10104480. Its totient is φ = 4995392.

The previous prime is 7535713. The next prime is 7535729. The reversal of 7535721 is 1275357.

It is an interprime number because it is at equal distance from previous prime (7535713) and next prime (7535729).

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 7535721 - 2³ = 7535713 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7535729) 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, 6480 + ... + 7553.

It is an arithmetic number, because the mean of its divisors is an integer number (1263060).

Almost surely, 2^7535721 is an apocalyptic number.

It is an amenable number.

7535721 is a deficient number, since it is larger than the sum of its proper divisors (2568759).

7535721 is a wasteful number, since it uses less digits than its factorization.

7535721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14215.

The product of its digits is 7350, while the sum is 30.

The square root of 7535721 is about 2745.1267730289. The cubic root of 7535721 is about 196.0536521871.

It can be divided in two parts, 7535 and 721, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 7535721 in words is "seven million, five hundred thirty-five thousand, seven hundred twenty-one".