32540721 has 8 divisors (see below), whose sum is σ = 43437504. Its totient is φ = 21668880.

The previous prime is 32540707. The next prime is 32540743. The reversal of 32540721 is 12704523.

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

It is not a de Polignac number, because 32540721 - 2¹⁰ = 32539697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 32540691 and 32540700.

It is not an unprimeable number, because it can be changed into a prime (32540701) 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, 2941 + ... + 8586.

It is an arithmetic number, because the mean of its divisors is an integer number (5429688).

Almost surely, 2^32540721 is an apocalyptic number.

It is an amenable number.

32540721 is a deficient number, since it is larger than the sum of its proper divisors (10896783).

32540721 is a wasteful number, since it uses less digits than its factorization.

32540721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12471.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 32540721 is about 5704.4474754353. The cubic root of 32540721 is about 319.2584423710.

The spelling of 32540721 in words is "thirty-two million, five hundred forty thousand, seven hundred twenty-one".