7909945 has 8 divisors (see below), whose sum is σ = 9528840. Its totient is φ = 6303360.

The previous prime is 7909943. The next prime is 7909949. The reversal of 7909945 is 5499097.

It can be written as a sum of positive squares in 4 ways, for example, as 451584 + 7458361 = 672^2 + 2731^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7909945 - 2¹ = 7909943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7909943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1596 + ... + 4285.

It is an arithmetic number, because the mean of its divisors is an integer number (1191105).

Almost surely, 2^7909945 is an apocalyptic number.

It is an amenable number.

7909945 is a deficient number, since it is larger than the sum of its proper divisors (1618895).

7909945 is a wasteful number, since it uses less digits than its factorization.

7909945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6155.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 7909945 is about 2812.4624441937. The cubic root of 7909945 is about 199.2467079845.

The spelling of 7909945 in words is "seven million, nine hundred nine thousand, nine hundred forty-five".