7220749 has 4 divisors (see below), whose sum is σ = 7236064. Its totient is φ = 7205436.

The previous prime is 7220747. The next prime is 7220761. The reversal of 7220749 is 9470227.

It is a happy number.

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 7220749 - 2¹ = 7220747 is a prime.

It is a super-2 number, since 2×7220749² = 104278432242002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7220749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220743) 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, 6927 + ... + 7900.

It is an arithmetic number, because the mean of its divisors is an integer number (1809016).

Almost surely, 2^7220749 is an apocalyptic number.

It is an amenable number.

7220749 is a deficient number, since it is larger than the sum of its proper divisors (15315).

7220749 is a wasteful number, since it uses less digits than its factorization.

7220749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15314.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 7220749 is about 2687.1451393626. The cubic root of 7220749 is about 193.2831892018.

The spelling of 7220749 in words is "seven million, two hundred twenty thousand, seven hundred forty-nine".