7909906 has 8 divisors (see below), whose sum is σ = 11933964. Its totient is φ = 3931920.

The previous prime is 7909903. The next prime is 7909919. The reversal of 7909906 is 6099097.

It can be written as a sum of positive squares in 2 ways, for example, as 6046681 + 1863225 = 2459^2 + 1365^2 .

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

It is a super-2 number, since 2×7909906² = 125133225857672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7909903) 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, 11085 + ... + 11776.

Almost surely, 2^7909906 is an apocalyptic number.

7909906 is a deficient number, since it is larger than the sum of its proper divisors (4024058).

7909906 is a wasteful number, since it uses less digits than its factorization.

7909906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23036.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 7909906 is about 2812.4555107592. The cubic root of 7909906 is about 199.2463805218.

The spelling of 7909906 in words is "seven million, nine hundred nine thousand, nine hundred six".