7742729 has 4 divisors (see below), whose sum is σ = 7749780. Its totient is φ = 7735680.

The previous prime is 7742723. The next prime is 7742737. The reversal of 7742729 is 9272477.

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 4687225 + 3055504 = 2165^2 + 1748^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7742729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7742692 and 7742701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7742723) 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, 1484 + ... + 4205.

It is an arithmetic number, because the mean of its divisors is an integer number (1937445).

Almost surely, 2^7742729 is an apocalyptic number.

It is an amenable number.

7742729 is a deficient number, since it is larger than the sum of its proper divisors (7051).

7742729 is a wasteful number, since it uses less digits than its factorization.

7742729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7050.

The product of its digits is 49392, while the sum is 38.

The square root of 7742729 is about 2782.5759648211. The cubic root of 7742729 is about 197.8326733135.

The spelling of 7742729 in words is "seven million, seven hundred forty-two thousand, seven hundred twenty-nine".