7940729 has 4 divisors (see below), whose sum is σ = 7946484. Its totient is φ = 7934976.

The previous prime is 7940719. The next prime is 7940747. The reversal of 7940729 is 9270497.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1428025 + 6512704 = 1195^2 + 2552^2 .

It is a cyclic number.

It is not a de Polignac number, because 7940729 - 2⁸ = 7940473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7940692 and 7940701.

It is not an unprimeable number, because it can be changed into a prime (7940719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569 + ... + 4025.

It is an arithmetic number, because the mean of its divisors is an integer number (1986621).

Almost surely, 2^7940729 is an apocalyptic number.

It is an amenable number.

7940729 is a deficient number, since it is larger than the sum of its proper divisors (5755).

7940729 is a wasteful number, since it uses less digits than its factorization.

7940729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5754.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 7940729 is about 2817.9299139617. The cubic root of 7940729 is about 199.5048501448.

The spelling of 7940729 in words is "seven million, nine hundred forty thousand, seven hundred twenty-nine".