7749945 has 64 divisors (see below), whose sum is σ = 16128000. Its totient is φ = 3457728.

The previous prime is 7749941. The next prime is 7749947. The reversal of 7749945 is 5499477.

7749945 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7749945 - 2² = 7749941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 7749945.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7749941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55686 + ... + 55824.

It is an arithmetic number, because the mean of its divisors is an integer number (252000).

Almost surely, 2^7749945 is an apocalyptic number.

It is an amenable number.

7749945 is an abundant number, since it is smaller than the sum of its proper divisors (8378055).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7749945 is a wasteful number, since it uses less digits than its factorization.

7749945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 213 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 7749945 is about 2783.8723031059. The cubic root of 7749945 is about 197.8941123452.

The spelling of 7749945 in words is "seven million, seven hundred forty-nine thousand, nine hundred forty-five".