729826521 has 8 divisors (see below), whose sum is σ = 1004492544. Its totient is φ = 470855760.

The previous prime is 729826477. The next prime is 729826529. The reversal of 729826521 is 125628927.

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

It is not a de Polignac number, because 729826521 - 2⁷ = 729826393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (729826529) 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, 3923706 + ... + 3923891.

It is an arithmetic number, because the mean of its divisors is an integer number (125561568).

Almost surely, 2^729826521 is an apocalyptic number.

It is an amenable number.

729826521 is a deficient number, since it is larger than the sum of its proper divisors (274666023).

729826521 is a wasteful number, since it uses less digits than its factorization.

729826521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7847631.

The product of its digits is 120960, while the sum is 42.

The square root of 729826521 is about 27015.3016085329. The cubic root of 729826521 is about 900.3400036354.

The spelling of 729826521 in words is "seven hundred twenty-nine million, eight hundred twenty-six thousand, five hundred twenty-one".