7172749 has 4 divisors (see below), whose sum is σ = 7404160. Its totient is φ = 6941340.

The previous prime is 7172731. The next prime is 7172791. The reversal of 7172749 is 9472717.

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 a cyclic number.

It is not a de Polignac number, because 7172749 - 2⁹ = 7172237 is a prime.

It is a Duffinian number.

7172749 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7172719) 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, 115659 + ... + 115720.

It is an arithmetic number, because the mean of its divisors is an integer number (1851040).

Almost surely, 2^7172749 is an apocalyptic number.

It is an amenable number.

7172749 is a deficient number, since it is larger than the sum of its proper divisors (231411).

7172749 is a wasteful number, since it uses less digits than its factorization.

7172749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231410.

The product of its digits is 24696, while the sum is 37.

The square root of 7172749 is about 2678.1988350382. The cubic root of 7172749 is about 192.8539527070.

Subtracting 7172749 from its reverse (9472717), we obtain a cube (2299968 = 132³).

It can be divided in two parts, 7172 and 749, that added together give a square (7921 = 89²).

The spelling of 7172749 in words is "seven million, one hundred seventy-two thousand, seven hundred forty-nine".