9029721 has 4 divisors (see below), whose sum is σ = 12039632. Its totient is φ = 6019812.

The previous prime is 9029719. The next prime is 9029723. The reversal of 9029721 is 1279209.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (9029719) and next prime (9029723).

It is not a de Polignac number, because 9029721 - 2¹ = 9029719 is a prime.

It is a super-2 number, since 2×9029721² = 163071722675682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9029723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1504951 + ... + 1504956.

It is an arithmetic number, because the mean of its divisors is an integer number (3009908).

Almost surely, 2^9029721 is an apocalyptic number.

It is an amenable number.

9029721 is a deficient number, since it is larger than the sum of its proper divisors (3009911).

9029721 is a wasteful number, since it uses less digits than its factorization.

9029721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3009910.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 9029721 is about 3004.9494172115. The cubic root of 9029721 is about 208.2371017252.

The spelling of 9029721 in words is "nine million, twenty-nine thousand, seven hundred twenty-one".