7429921 has 8 divisors (see below), whose sum is σ = 7549704. Its totient is φ = 7311360.

The previous prime is 7429913. The next prime is 7429951. The reversal of 7429921 is 1299247.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1079521 + 6350400 = 1039^2 + 2520^2 .

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 7429921 - 2³ = 7429913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7429951) 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, 26301 + ... + 26581.

It is an arithmetic number, because the mean of its divisors is an integer number (943713).

Almost surely, 2^7429921 is an apocalyptic number.

It is an amenable number.

7429921 is a deficient number, since it is larger than the sum of its proper divisors (119783).

7429921 is a wasteful number, since it uses less digits than its factorization.

7429921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611.

The product of its digits is 9072, while the sum is 34.

The square root of 7429921 is about 2725.7881429047. The cubic root of 7429921 is about 195.1318065704.

The spelling of 7429921 in words is "seven million, four hundred twenty-nine thousand, nine hundred twenty-one".